Anti-pd-1 antibodies for treatment of lung cancer

ABSTRACT

The present invention provides methods for treating, reducing the severity, or inhibiting the growth of cancer (e.g., lung cancer). The methods of the present invention comprise administering a therapeutically effective amount of a programmed death 1 (PD-1) antagonist (e.g., an anti-PD-1 antibody), to a subject with lung cancer wherein the cancer tissue expresses PD-L1.

This application is a continuation of U.S. patent application Ser. No. 16/486,688 filed Aug. 16, 2019, which is a U.S. national phase application under 35 U.S.C. § 371 of International Patent Application No. PCT/US2018/018747 filed Feb. 20, 2018, which claims the benefit of priority to U.S. Provisional Patent Appl. No. 62/595,190 filed Dec. 6, 2017 and U.S. Provisional Patent Appl. No. 62/461,672 filed Feb. 21, 2017, the disclosures of all of which are hereby incorporated by reference in their entireties.

FIELD OF THE INVENTION

The present invention relates to methods for treating lung cancer comprising administering to a subject in need thereof a therapeutically effective amount of an antibody that specifically binds to programmed death 1 (PD-1) receptor.

BACKGROUND

Lung cancer is one of the most commonly diagnosed cancers and is the leading cause of cancer-related mortality worldwide (Bray et al 2013, Int. J. Cancer 132:1133-45; Siegel et al 2016, CA Cancer J. Clin. 66: 7-30). Non-small cell lung cancer (NSCLC) accounts for 80% to 85% of all lung cancers and is composed of several histopathological subtypes, the most common of which include adenocarcinoma (40% to 60%) and squamous cell carcinoma (30%). The majority of patients with NSCLC are found to have advanced cancer at the time of diagnosis (Leighl 2012, Curr. Oncol. 19:S52-8). With chemotherapy, these patients have a median overall survival (OS) of up to 12 to 18 months and a 5-year survival rate of approximately 18% (Leighl 2012, Curr. Oncol. 19:S52-8; Siegel et al 2016, CA Cancer J. Clin. 66: 7-30).

Systemic therapy with platinum-based doublet chemotherapy regimens, with or without maintenance therapy, has been, until recently, the standard first-line treatment for all patients with advanced NSCLC whose tumors do not have an epidermal growth factor receptor (EGFR) mutation, an anaplastic lymphoma kinase (ALK) translocation, or a C-ros oncogene receptor tyrosine kinase (ROS1) mutation (Besse et al 2014, Ann. Oncol. 25: 1475-84; Ettinger et al 2016, J. Natl. Compr. Canc. Netw. 14: 255-64; Reck et al 2014, Ann. Oncol. 25 Suppl 3: iii27-39). Despite initial therapy with platinum-based doublet chemotherapy regimens, the disease often progresses, and additional treatment options have been limited. Therefore, newer therapeutic approaches are needed that will improve long-term survival and quality of life (QOL) in patients with advanced NSCLC.

In recent years, immunotherapies have been investigated as potential therapeutic approaches that will improve long-term survival and QOL in patients with advanced NSCLC. Tumors modulate and evade the host immune response through a number of mechanisms, including formation of an immune-suppressive environment within the tumor. Programmed cell death-1 (PD-1) is a co-receptor expressed on the surface of activated T-cells that mediates immunosuppression. The binding of PD-1 to one of its ligands, programmed cell death ligand 1 (PD-L1) or programmed cell death ligand 2 (PD-L2), results in the inhibition of a cytotoxic T-cell response. Increased expression of PD-L1 in the tumor microenvironment facilitates escape from the immune-surveillance mechanism (T-cell-induced anti-tumor activity). In contrast, blockade of this interaction results in an enhanced T-cell response with anti-tumor activity.

Blockade of the PD-1/PD-L1 T-cell checkpoint pathway has been shown to be an effective and well-tolerated approach to stimulating the immune response and has achieved significant objective responses in patients with NSCLC (Topalian et al 2012, N. Engl. J. Med. 366: 2443-54; Borghaei et al 2015, N. Engl. J. Med. 373: 1627-39; Brahmer et al 2015, N. Engl. J. Med. 373: 123-35; Herbst et al 2016, Lancet 387: 1540-50; Fehrenbacher et al 2016, Lancet 387: 1837-46; Rittmeyer et al 2017, Lancet 389: 255-65; Reck et al 2016; N. Engl. J. Med. 375: 1823-33; Roach et al 2016, App.l Immunohistochem. Mol. Morphol. 24: 392-7; Socinski et al 2016, Ann. Oncol. 27 Suppl 6:LBA7_PR).

BRIEF SUMMARY OF THE INVENTION

According to certain embodiments, the present invention provides methods for treating or ameliorating at least one symptom or indication of lung cancer, inhibiting the growth of lung cancer, and/or increasing the survival in a subject. The methods according to this aspect comprise administering to a subject in need thereof one or more doses of a therapeutically effective amount of an antibody or antigen-binding fragment thereof that specifically binds to programmed death 1 (PD-1). In certain embodiments, the lung cancer is non-small cell lung cancer. In one embodiment, the subject has advanced recurrent or metastatic lung cancer. In one embodiment, the subject has squamous non-small cell lung cancer. In one embodiment, the subject has non-squamous non-small cell lung cancer. In certain embodiments, the subject has lung cancer wherein the tumors express programmed death ligand 1 (PD-L1) in <50% of tumor cells. In certain embodiments, the subject has lung cancer (e.g., non-small cell lung cancer) wherein the tumors express PD-L1 in <50%, ≤45%, ≤40%, ≤30%, ≤20%, ≤10%, ≤5%, ≤2%, Q % or about 0% of tumor cells. In certain other embodiments, the subject has lung cancer wherein the tumors express PD-L1 in ≥50% of tumor cells. In certain embodiments, the subject has lung cancer (e.g., non-small cell lung cancer) wherein the tumors express PD-L1 in ≥50%, ≥60%, ≥70%, ≥80%, or ≥90% of tumor cells. In certain embodiments, the subject has been treated with a treatment for lung cancer (an anti-tumor therapy, e.g., chemotherapy). In certain embodiments, the methods comprise administering one or more doses of an anti-PD-1 antibody to the subject in need thereof wherein each dose comprises 20 mg to 1500 mg of the anti-PD-1 antibody and wherein each dose is administered 1 week, 2 weeks, 3 weeks or 4 weeks after the immediately preceding dose. In certain embodiments, the methods comprise administering to a subject in need thereof a therapeutically effective amount of an anti-PD-1 antibody, optionally, in combination with chemotherapy, or a CTLA-4 inhibitor (e.g., an anti-CTLA-4 antibody such as ipilimumab). In one embodiment, the chemotherapy comprises a platinum-based chemotherapeutic agent (e.g., pemtrexed, cisplatin, gemcitabine or a combination thereof). In one embodiment, the anti-PD-1 antibody is REGN2810.

According to certain embodiments, the present invention includes methods to treat cancer, the methods comprising selecting a subject with lung cancer and administering one or more doses of an anti-PD-1 antibody, wherein the administration results in inhibition of tumor growth, an increase in overall survival, and/or an increase in progression-free survival of the subject.

In certain embodiments of the present invention, methods are provided for treating or ameliorating at least one symptom or indication, or inhibiting the growth of cancer in a subject. In certain embodiments of the present invention, methods are provided for delaying the growth of a tumor or preventing tumor recurrence. In certain embodiments of the present invention, methods are provided for increasing the overall or progression-free survival of a patient with cancer. The methods, according to this aspect of the invention, comprise sequentially administering one or more doses of a therapeutically effective amount of an antibody or antigen-binding fragment thereof that specifically binds to PD-1. In one embodiment, the anti-PD-1 antibody is administered in combination with chemotherapy. In one embodiment, the anti-PD-1 antibody is administered in combination with a CTLA-4 inhibitor (e.g., an anti-CTLA-4 antibody such as ipilimumab). In certain embodiments, the cancer or tumor is a solid tumor or malignancy. In certain embodiments, the solid tumor is selected from the group consisting of colorectal cancer, ovarian cancer, prostate cancer, breast cancer, brain cancer, cervical cancer, bladder cancer, anal cancer, uterine cancer, colon cancer, liver cancer, pancreatic cancer, lung cancer, endometrial cancer, bone cancer, testicular cancer, skin cancer, kidney cancer, stomach cancer, esophageal cancer, head and neck cancer, salivary gland cancer, and myeloma.

In certain embodiments, the methods comprise administering one or more doses of an anti-PD-1 antibody to a patient with advanced or metastatic cancer (e.g., advanced non-small cell lung cancer), wherein tumor tissue in the patient expresses PD-L1 in ≤1%, ≤2%, ≤5%, ≤10%, ≤20%, ≤30%, 40%, ≤45%, or ≤50% of tumor cells. In certain embodiments, the methods comprise administering one or more doses of an anti-PD-1 antibody to a patient with cancer (e.g., advanced or metastatic lung cancer), wherein tumor tissue in the patient expresses PD-L1 in ≥50%, ≥60%, ≥70%, ≥80%, or ≥90% of tumor cells.

In certain embodiments, the anti-PD-1 antibody is administered as a ‘first-line’ treatment to a patient with cancer, wherein the patient has not received prior systemic treatment for the cancer. In certain embodiments, the anti-PD-1 antibody is administered as ‘second-line’ treatment to a patient with cancer (e.g., metastatic cancer), wherein the patient has been previously treated with therapy including, but not limited to an anti-PD-1 antibody (e.g., nivolumab or pembrolizumab), a CTLA-4 inhibitor (e.g., an anti-CTLA-4 antibody), chemotherapy, surgery and/or radiation.

In certain embodiments, each dose of anti-PD-1 antibody comprises 0.1-20 mg/kg of the subject's body weight. In certain embodiments, each dose of anti-PD-1 antibody comprises 0.3, 1, 3, 5, or 10 mg/kg of the subject's body weight. In certain embodiments, each dose of the anti-PD-1 antibody comprises 20-1500 mg. In one embodiment, each dose of the anti-PD-1 antibody comprises about 200 mg. In one embodiment, each dose of the anti-PD-1 antibody comprises about 250 mg. In one embodiment, each dose of the anti-PD-1 antibody comprises about 350 mg. In one embodiment, each dose of the anti-PD-1 antibody comprises about 1000 mg or about 1050 mg.

In certain embodiments, the methods of the present invention comprise administering a therapeutically effective amount of an anti-PD-1 antibody prior to, concurrent with, or subsequent to chemotherapy. In one embodiment, the methods of the present invention comprise administering an anti-PD-1 antibody prior to a dose of chemotherapy.

In certain embodiments, the methods of the present invention comprise administering one or more therapeutic doses each of an anti-PD-1 antibody, wherein each dose is administered 0.5-12 weeks after the immediately preceding dose. In one embodiment, each dose is administered 1 week after the immediately preceding dose. In one embodiment, each dose is administered 2 weeks after the immediately preceding dose. In one embodiment, each dose is administered 3 weeks after the immediately preceding dose.

In certain embodiments, the one or more doses of anti-PD-1 antibody and optionally a second therapeutic (e.g., a chemotherapeutic agent) are comprised in a treatment cycle. The methods, according to this aspect of the invention, comprise administering to a subject in need thereof at least one treatment cycle wherein the at least one treatment cycle comprises one or more doses of an anti-PD-1 antibody. In certain embodiments, at least one treatment cycle further comprises one or more doses of a chemotherapeutic agent (e.g., platinum-based chemotherapeutic agent such as gemcitabine, pemetrexed, cisplatin).

In certain embodiments, the anti-PD-1 antibody is administered in combination with an additional therapeutic agent or therapy (e.g., an anti-CTLA-4 antibody, or any agent or therapy disclosed herein).

In certain embodiments, the treatment produces one or more therapeutic effects selected from the group consisting of tumor regression, abscopal effect inhibition of tumor metastasis, reduction in metastatic lesions over time, reduced use of chemotherapeutic or cytotoxic agents, reduction in tumor burden, increase in progression-free survival, increase in overall survival, complete response, partial response, and stable disease.

According to certain embodiments, the anti-PD-1 antibody or antigen-binding protein comprises the heavy chain complementarity determining regions (HCDRs) of a heavy chain variable region (HCVR) comprising the amino acid sequence of SEQ ID NO: 1 and the light chain CDRs of a light chain variable region (LCVR) comprising the amino acid sequence of SEQ ID NO: 2. One such type of antigen-binding protein that can be used in the context of the methods of the present invention is an anti-PD-1 antibody such as REGN2810 (also known as cemiplimab).

In certain embodiments, the present invention provides use of an anti-PD-1 antibody or antigen-binding fragment thereof in the manufacture of a medicament to treat or inhibit the growth of cancer in a subject, including humans. In certain embodiments, the cancer is lung cancer. In certain embodiments, the lung cancer is non-small cell lung cancer. In certain embodiments, the cancer is colorectal cancer, ovarian cancer, prostate cancer, breast cancer, brain cancer, cervical cancer, bladder cancer, anal cancer, uterine cancer, colon cancer, liver cancer, pancreatic cancer, lung cancer, endometrial cancer, bone cancer, testicular cancer, skin cancer, kidney cancer, stomach cancer, esophageal cancer, head and neck cancer, salivary gland cancer, or myeloma.

Other embodiments of the present invention will become apparent from a review of the ensuing detailed description.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows the study design including dosing of an anti-PD-1 antibody and radiation (XRT) in mice implanted with MC38 tumors (study described in Example 1 herein).

FIG. 2 shows the average tumor growth in mice treated with isotype control antibody (●), anti-PD-1 antibody (▪), isotype control+radiation (XRT) (▴), or anti-PD-1 antibody+XRT (▾) in the study described in Example 1 herein.

FIG. 3 shows the overall survival of mice treated with isotype control antibody (●), anti-PD-1 antibody (▪), isotype control+radiation (XRT) (▴), or anti-PD-1 antibody+XRT (▾) in the study described in Example 1 herein.

FIG. 4 shows the study design including dosing of an anti-PD-1 antibody and radiation (XRT) in mice implanted with B16F10.9 tumors (study described in Example 2 herein).

FIG. 5 shows the average tumor growth in mice treated with isotype control antibody (●), anti-PD-1 antibody (▪), isotype control+radiation (XRT) (♦), or anti-PD-1 antibody+XRT (◯) in the study described in Example 2 herein.

FIG. 6 shows the overall survival of mice treated with isotype control antibody (●), anti-PD-1 antibody (▪), isotype control+radiation (XRT) (♦), or anti-PD-1 antibody+XRT (◯) in the study described in Example 2 herein.

FIG. 7 shows the study design including dosing of an anti-PD-1 antibody and radiation (XRT) in mice implanted with MC38 tumors (study described in Example 4 herein)

FIG. 8 shows average primary tumor growth in mice treated with isotype control antibody (●), anti-PD-1 antibody (▪), isotype control+radiation (XRT) (▴), or anti-PD-1 antibody+XRT (▾) in the study described in Example 4 herein.

FIG. 9 shows overall survival of mice treated with isotype control antibody (●), anti-PD-1 antibody (▪), isotype control+radiation (XRT) (▴), or anti-PD-1 antibody+XRT (▾) in the study described in Example 4 herein.

FIG. 10 shows secondary tumor growth in mice treated with isotype control antibody (●), anti-PD-1 antibody (▪), isotype control+radiation (XRT) (▴), or anti-PD-1 antibody+XRT (▾) in the study described in Example 4 herein.

FIG. 11 shows the study design including dosing of an anti-PD-1 antibody, an anti-GITR antibody, and radiation (XRT) in mice implanted with MC38 tumors (study described in Example 5 herein).

FIG. 12 shows the average tumor growth in mice treated with isotype control antibody (●), anti-PD-1 antibody (▪), anti-GITR antibody (▴), combination of anti-PD-1 antibody and anti-GITR antibody (▾), isotype control+radiation (XRT) (♦), anti-PD-1 antibody+XRT (◯), anti-GITR antibody+XRT (□), or combination of anti-PD-1 antibody, anti-GITR antibody+XRT (Δ) in the study described in Example 5 herein.

FIG. 13 shows the overall survival of mice treated with isotype control antibody (●), anti-PD-1 antibody (▪), anti-GITR antibody (▴), combination of anti-PD-1 antibody and anti-GITR antibody (▾), isotype control+radiation (XRT) (♦), anti-PD-1 antibody+XRT (◯), anti-GITR antibody+XRT (□), or combination of anti-PD-1 antibody, anti-GITR antibody+XRT (Δ) in the study described in Example 5 herein.

FIG. 14A shows a radiographic image of lung metastases in a basal cell carcinoma (BCC) patient indicated by arrows at baseline, left, and at Week 24, right.

FIG. 14B shows a radiographic image of neck mass in a cutaneous squamous cell carcinoma (CSCC) patient at baseline, left, and at Week 16, right.

DETAILED DESCRIPTION

Before the present invention is described, it is to be understood that this invention is not limited to particular methods and experimental conditions described, as such methods and conditions may vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting, since the scope of the present invention will be limited only by the appended claims.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. As used herein, the term “about,” when used in reference to a particular recited numerical value, means that the value may vary from the recited value by no more than 1%. For example, as used herein, the expression “about 100” includes 99 and 101 and all values in between (e.g., 99.1, 99.2, 99.3, 99.4, etc.).

Although any methods and materials similar or equivalent to those described herein can be used in the practice of the present invention, the preferred methods and materials are now described. All publications mentioned herein are incorporated herein by reference to describe in their entirety.

Methods of Treating or Inhibiting Growth of Cancer

The present invention includes methods for treating, ameliorating or reducing the severity of at least one symptom or indication, or inhibiting the growth of a cancer in a subject. The methods according to this aspect of the invention comprise administering to a subject in need thereof a therapeutically effective amount of an antibody or antigen-binding fragment thereof that specifically binds PD-1. In certain embodiments, the anti-PD-1 antibody is administered in combination with an anti-tumor therapy (described elsewhere herein). As used herein, the terms “treat”, “treating”, or the like, mean to alleviate symptoms, eliminate the causation of symptoms either on a temporary or permanent basis, to delay or inhibit tumor growth, to reduce tumor cell load or tumor burden, to promote tumor regression, to cause tumor shrinkage, necrosis and/or disappearance, to prevent tumor recurrence, to prevent or inhibit metastasis, to inhibit metastatic tumor growth, and/or to increase duration of survival of the subject.

As used herein, the expression “a subject in need thereof” means a human or non-human mammal that exhibits one or more symptoms or indications of cancer, and/or who has been diagnosed with cancer, including a solid tumor and who needs treatment for the same. In many embodiments, the term “subject” may be interchangeably used with the term “patient”. For example, a human subject may be diagnosed with a primary or a metastatic tumor and/or with one or more symptoms or indications including, but not limited to, unexplained weight loss, general weakness, persistent fatigue, loss of appetite, fever, night sweats, bone pain, shortness of breath, swollen abdomen, chest pain/pressure, enlargement of spleen, and elevation in the level of a cancer-related biomarker (e.g., CA125). The expression includes subjects with primary or established tumors. In specific embodiments, the expression includes human subjects that have and/or need treatment for a solid tumor, e.g., colon cancer, breast cancer, lung cancer, prostate cancer, skin cancer, liver cancer, bone cancer, ovarian cancer, cervical cancer, pancreatic cancer, head and neck cancer, and brain cancer. In certain preferred embodiments, the expression includes human subjects that have and/or need treatment for lung cancer including non-small cell lung cancer. In one preferred embodiment, the expression includes patients that have and/or need treatment for advanced recurrent or metastatic non-small cell lung cancer. In another preferred embodiment, the expression includes patients that have and/or need treatment for squamous or non-squamous non-small cell lung cancer. The term includes subjects with primary or metastatic tumors (advanced malignancies). In certain embodiments, the expression “a subject in need thereof” includes patients with a solid tumor that is resistant to or refractory to or is inadequately controlled by prior therapy (e.g., treatment with an anti-cancer agent). For example, the expression includes subjects who have been treated with one or more lines of prior therapy such as treatment with chemotherapy (e.g., carboplatin or docetaxel). In certain embodiments, the expression “a subject in need thereof” includes patients with a solid tumor which has been treated with one or more lines of prior therapy but which has subsequently relapsed or metastasized. For example, patients with a solid tumor that may have received treatment with one or more anti-cancer agents leading to tumor regression; however, subsequently have relapsed with cancer resistant to the one or more anti-cancer agents (e.g., chemotherapy-resistant cancer) are treated with the methods of the present invention. The expression also includes subjects with a solid tumor for which conventional anti-cancer therapy is inadvisable, for example, due to toxic side effects. For example, the expression includes patients who have received one or more cycles of chemotherapy with toxic side effects.

In certain embodiments, the methods of the present invention may be used to treat patients that show elevated levels of one or more cancer-associated biomarkers [e.g., programmed death ligand 1 (PD-L1), CA125, CA19-9, prostate-specific antigen (PSA), lactate dehydrogenase, KIT, carcinoembryonic antigen, epidermal growth factor receptor (EGFR), ALK gene rearrangement]. For example, the methods of the present invention comprise administering a therapeutically effective amount of an anti-PD-1 antibody to a patient with an elevated level of PD-L1 in the tumor tissue. In certain embodiments, the methods of the present invention comprise administering a therapeutically effective amount of an anti-PD-1 antibody to a patient with lung cancer wherein tumor tissue in the patient expresses PD-L1 in ≤50%, 45%, ≤40%, ≤30%, ≤20%, ≤10%, ≤5%, ≤2%, or ≤1% of tumor cells. In certain embodiments, the methods of the present invention comprise administering a therapeutically effective amount of an anti-PD-1 antibody to a patient with lung cancer wherein tumor tissue in the patient expresses PD-L1 in 50%, ≥60%, ≥70%, ≥80%, or 90% of tumor cells.

In certain embodiments, the methods of the present invention are used in a subject with a solid tumor. The terms “tumor”, “cancer” and “malignancy” are interchangeably used herein.

As used herein, the term “solid tumor” refers to an abnormal mass of tissue that usually does not contain cysts or liquid areas. Solid tumors may be benign (not cancer) or malignant (cancer). For the purposes of the present invention, the term “solid tumor” means malignant solid tumors. The term includes different types of solid tumors named for the cell types that form them, viz. sarcomas, carcinomas and lymphomas. However, the term does not include leukemias. In various embodiments, the term ‘solid tumor” includes cancers arising from connective or supporting tissue (e.g., bone or muscle) (referred to as sarcomas), cancers arising from the body's glandular cells and epithelial cells which line body tissues (referred to as carcinomas), and cancers of the lymphoid organs such as lymph nodes, spleen and thymus (referred to as lymphomas). Lymphoid cells occur in almost all tissues of the body and therefore, lymphomas may develop in a wide variety of organs. In certain embodiments, the term “solid tumor” includes cancers including, but not limited to, colorectal cancer, ovarian cancer, prostate cancer, breast cancer, brain cancer, cervical cancer, bladder cancer, anal cancer, uterine cancer, colon cancer, liver cancer, pancreatic cancer, lung cancer, endometrial cancer, bone cancer, testicular cancer, skin cancer, kidney cancer, stomach cancer, esophageal cancer, head and neck cancer, salivary gland cancer, and myeloma. In certain embodiments, the term “solid tumor” includes cancers including, but not limited to, hepatocellular carcinoma, non-small cell lung cancer, head and neck squamous cell cancer, basal cell carcinoma, breast carcinoma, cutaneous squamous cell carcinoma, chondrosarcoma, angiosarcoma, cholangiocarcinoma, soft tissue sarcoma, colorectal cancer, melanoma, Merkel cell carcinoma, and glioblastoma multiforme. In certain embodiments, the term “solid tumor” comprises more than one solid tumor lesions located separate from one another, e.g., 2, more than 2, more than 5, more than 10, more than 15, more than 20, or more than 25 lesions in a subject in need of treatment. In certain embodiments, the more than one lesions are located distally from one another in the same organ. In certain other embodiments, the tumor lesions may be located in different organs.

In certain embodiments, the present invention includes methods to treat or inhibit growth of a cancer including, but not limited to, colorectal cancer, ovarian cancer, prostate cancer, breast cancer, brain cancer, cervical cancer, bladder cancer, anal cancer, uterine cancer, colon cancer, liver cancer, pancreatic cancer, lung cancer, endometrial cancer, bone cancer, testicular cancer, skin cancer, kidney cancer, stomach cancer, esophageal cancer, head and neck cancer, salivary gland cancer, and myeloma. In certain embodiments, the present invention includes methods to treat or inhibit the growth of a cancer including, but not limited to, hepatocellular carcinoma, non-small cell lung cancer, head and neck squamous cell cancer, basal cell carcinoma, cutaneous squamous cell carcinoma, chondrosarcoma, angiosarcoma, cholangiocarcinoma, soft tissue sarcoma, colorectal cancer, melanoma, Merkel cell carcinoma, and glioblastoma multiforme. In certain embodiments, the present invention includes methods to treat advanced solid tumors including but not limited to, metastatic cutaneous squamous cell carcinoma (CSCC), unresectable locally advanced CSCC, metastatic colorectal cancer, advanced or metastatic hepatocellular cancer, advanced non-small cell lung cancer, recurrent glioblastoma multiforme, castrate recurrent prostate cancer and any advanced solid tumor refractory to first-line therapy. The methods, according to this aspect, comprise administering a therapeutically effective amount of an anti-PD-1 antibody, optionally, in combination with an anti-tumor therapy. Anti-tumor therapies include, but are not limited to, conventional anti-tumor therapies such as chemotherapy, radiation, a CTLA-4 inhibitor (e.g., an anti-CTLA-4 antibody), and surgery. Other anti-tumor therapies are described elsewhere herein. In one embodiment, the anti-tumor therapy comprises platinum-based chemotherapy. In certain embodiments, one or more doses of an anti-PD-1 antibody are administered to a subject in need thereof, wherein each dose is administered 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 weeks after the immediately preceding dose. In certain embodiments, each dose comprises 0.1-10 mg/kg (e.g., 0.3 mg/kg, 1 mg/kg, 3 mg/kg, or 10 mg/kg) of the subject's body weight. In certain other embodiments, each dose comprises 20-1500 mg of the anti-PD-1 antibody, e.g., 50 mg, 100 mg, 150 mg, 200 mg, 250 mg, 300 mg, 350 mg, 400 mg, 500 mg, 550 mg, 600 mg, 700 mg, 750 mg, 800 mg, 900 mg, 1000 mg, 1050 mg, 1200 mg, or 1500 mg of the anti-PD-1 antibody.

In certain embodiments, the present invention includes methods to treat a cancer or inhibit the growth of a cancer with microsatellite instability (MSI). As used herein, the term “microsatellite instability,” also known as “MSI” refers to the changes in microsatellite repeats in tumor cells or genetic hypermutability caused due to deficient DNA mismatch repair. Microsatellites, also known as simple sequence repeats, are repeated sequences of DNA comprising repeating units 1-6 base pairs in length. Although the length of microsatellites is highly variable from person to person and contributes to the DNA fingerprint, each individual has microsatellites of a set length. MSI results from the inability of the mismatch repair (MMR) proteins to fix a DNA replication error. MSI comprises DNA polymorphisms, wherein the replication errors vary in length instead of sequence. MSI comprises frame-shift mutations, either through insertions or deletions, or hypermethylation, leading to gene silencing. It is known in the art that microsatellite instability may result in colon cancer, gastric cancer, endometrium cancer, ovarian cancer, hepatobiliary tract cancer, urinary tract cancer, brain cancer, and skin cancers. The present invention includes methods to treat cancers with MSI, the methods comprising administering to a patient in need thereof a therapeutically effective amount of an anti-PD-1 antibody, optionally, in combination with a second anti-tumor agent (e.g., chemotherapy, radiation therapy).

As used herein, the term “chemotherapy”, refers to use of a chemotherapeutic agent (a chemical compound used for anti-tumor therapy). The term includes, but is not limited to, alkylating agents, antimetabolites, kinase inhibitors, spindle poison plant alkaloids, cytoxic/antitumor antibiotics, topisomerase inhibitors, photosensitizers, anti-estrogens and selective estrogen receptor modulators (SERMs), anti-progesterones, estrogen receptor down-regulators (ERDs), estrogen receptor antagonists, leutinizing hormone-releasing hormone agonists, anti-androgens, aromatase inhibitors, EGFR inhibitors, and VEGF inhibitors. Examples of chemotherapeutic agents are disclosed elsewhere herein. In one embodiment, the term refers to platinum-based chemotherapeutic agents (e.g., gemcitabine, cisplatin, carboplatin, pemetrexed or a combination thereof). The chemotherapeutic agents are administered according to administrative regimens known in the art.

As used herein, the term “radiation therapy”, also referred to as “XRT” means using ionizing radiation to kill cancer cells, generally as part of anti-cancer therapy. X-rays, gamma rays or charged particles (e.g., protons or electrons) are used to generate ionizing radiation. Radiation therapy may be delivered by a machine placed outside the patient's body (external-beam radiation therapy), or by a source placed inside a patient's body (internal radiation therapy or brachytherapy), or through systemic radioisotopes delivered intravenously or orally (systemic radioisotope therapy). Radiation therapy may be planned and administered in conjunction with imaging-based techniques such a computed tomography (CT), magnetic resonance imaging (MRI) to accurately determine the dose and location of radiation to be administered. In various embodiments, radiation therapy is selected from the group consisting of total all-body radiation therapy, conventional external beam radiation therapy, stereotactic radiosurgery, stereotactic body radiation therapy, 3-D conformal radiation therapy, intensity-modulated radiation therapy, image-guided radiation therapy, tomotherapy, brachytherapy, and systemic radiation therapy. Depending upon the intent, in certain embodiments, radiation therapy is curative, adjuvinating or palliative. In specific embodiments, the term “radiation therapy” refers to hypofractionated radiation therapy. Hypofractionated radiation therapy refers to radiation therapy in which a radiation dose is comprised in 2 or more fractions. In various embodiments, each fraction comprises 2-20 Gy. For example, a radiation dose of 50 Gy may be split up into 10 fractions, each comprising 5 Gy. In certain embodiments, the 2 or more fractions are administered on consecutive or sequential days. In certain other embodiments, the 2 or more fractions are administered once in 2 days, once in 3 days, once in 4 days, once in 5 days, once in 6 days, once in 7 days, or in a combination thereof.

According to certain embodiments, the present invention includes methods for treating, or delaying or inhibiting the growth of a tumor. In certain embodiments, the present invention includes methods to promote tumor regression. In certain embodiments, the present invention includes methods to reduce tumor cell load or to reduce tumor burden. In certain embodiments, the present invention includes methods to prevent tumor recurrence. The methods, according to this aspect of the invention, comprise sequentially administering a therapeutically effective amount of an anti-PD-1 antibody in combination with a second anti-tumor therapy to a subject in need thereof, wherein the antibody is administered to the subject in multiple doses, e.g., as part of a specific therapeutic dosing regimen. For example, the therapeutic dosing regimen may comprise administering one or more doses of an anti-PD-1 antibody to the subject at a frequency of about once a day, once every two days, once every three days, once every four days, once every five days, once every six days, once a week, once every two weeks, once every three weeks, once every four weeks, once a month, once every two months, once every three months, once every four months, or less frequently. In certain embodiments, the one or more doses of anti-PD-1 antibody are administered in combination with one or more doses of a second anti-tumor therapy, wherein the one or more doses of the second anti-tumor therapy are administered to the subject at a frequency of about once a week, once every two weeks, once every three weeks, once every four weeks, once a month, once every two months, once every three months, once every four months, or less frequently.

In certain embodiments, the one or more doses are comprised in a treatment cycle. The methods, according to this aspect, comprise administering to a subject in need thereof at least one treatment cycle, wherein the at least one treatment cycle comprises 1-10 doses of an anti-PD-1 antibody and optionally one or more doses of chemotherapy. In certain embodiments, 2-12 or more treatment cycles are administered to a subject in need thereof.

In specific embodiments, the present invention provides methods for increased anti-tumor efficacy or increased tumor inhibition. The methods, according to this aspect of the invention, comprise administering to a subject with a solid tumor a therapeutically effective amount of an anti-PD-1 antibody prior to administering a dose of a second anti-tumor therapy (e.g., chemotherapy or an anti-CTLA-4 antibody), wherein the anti-PD-1 antibody may be administered about 1 day, more than 1 day, more than 2 days, more than 3 days, more than 4 days, more than 5 days, more than 6 days, more than 7 days, or more than 8 days prior to the second anti-tumor therapy. In certain embodiments, the methods provide for increased tumor inhibition, e.g., by about 20%, more than 20%, more than 30%, more than 40% more than 50%, more than 60%, more than 70% or more than 80% as compared to a subject administered with a dose of anti-tumor therapy (e.g., chemotherapy) prior to the anti-PD-1 antibody. In certain embodiments, the chemotherapy comprises platinum-based chemotherapy. In certain embodiments, the second anti-tumor therapy comprises a CTLA-4 inhibitor (e.g., an anti-CTLA-4 antibody).

In certain embodiments, the present invention provides methods for treating cancer, the methods comprising selecting a subject with a first tumor lesion and at least a second tumor lesion and administering one or more doses of an anti-PD-1 antibody in combination with radiation therapy such that both the lesions are treated. In specific embodiments, the methods comprise administering radiation therapy to the first tumor lesion but not the second tumor lesion wherein the administration leads to tumor regression in both the tumor lesions (abscopal effect). In certain embodiments, the methods comprising selecting a subject with a first tumor lesion and at least a second tumor lesion and administering one or more doses of an anti-PD-1 antibody in combination with hypofractionated radiation therapy wherein the hypofractionated radiation therapy is administered to the first lesion but not the second lesion and wherein both the lesions are treated upon such administration. In certain embodiments, the anti-PD-1 antibody is administered before radiation therapy.

In certain embodiments, the present invention includes methods for treating cancer, the methods comprising administering to a subject in need thereof one or more sub-therapeutic doses of an anti-PD-1 antibody in combination with one or more anti-tumor therapies, e.g., radiation therapy. As defined elsewhere herein, the term “sub-therapeutic dose” refers to a dose less than a therapeutic dose and may be used to reduce toxicity of the administered therapy. In certain embodiments, administering a sub-therapeutic dose of an anti-PD-1 antibody in combination with radiation therapy results in therapeutic anti-tumor efficacy as compared to administration of the sub-therapeutic dose of the anti-PD-1 antibody alone. In certain other embodiments, the methods of the present invention comprise administering a therapeutically effective amount of an anti-PD-1 antibody in combination with a sub-therapeutic dose of an anti-tumor therapy such as chemotherapy or radiation. For example, a therapeutically effective amount of an anti-PD-1 antibody may be administered in combination with a sub-therapeutic dose of cyclophosphamide, for increased efficacy as compared to either monotherapy.

In certain embodiments, the present invention includes methods to inhibit, retard or stop tumor metastasis or tumor infiltration into peripheral organs. The methods, according to this aspect, comprise administering a therapeutically effective amount of an anti-PD-1 antibody to a subject in need thereof. In certain embodiments, the anti-PD-1 antibody is administered in combination with chemotherapy. In one embodiment, the chemotherapy is platinum-based chemotherapy. In one embodiment, the chemotherapy is administered before, concurrent with or after administering one or more doses of the anti-PD-1 antibody.

In certain embodiments, the methods of the present invention comprise administering a therapeutically effective amount of anti-PD-1 antibody to a subject with advanced solid tumors. In specific embodiments, the advanced solid tumor is metastatic lung cancer, head and neck cancer, hepatocellular cancer, or breast cancer. In certain other embodiments, the advanced solid tumor is cutaneous squamous cell cancer. In certain embodiments, the advanced solid tumor is indolent or aggressive. In certain embodiments, the subject is not responsive to prior therapy or has relapsed after prior therapy (e.g., with carboplatin). In certain embodiments, the subject has an advanced solid tumor that is refractory to first line chemotherapy. In certain further embodiments, the methods of the present invention further comprise administering an additional anti-cancer therapy (e.g., a CTLA-4 inhibitor) to a subject with an advanced solid tumor.

In certain embodiments, the present invention includes methods to treat or inhibit growth of a cancer including, but not limited to, colorectal cancer, ovarian cancer, prostate cancer, breast cancer, brain cancer, cervical cancer, bladder cancer, anal cancer, uterine cancer, colon cancer, liver cancer, pancreatic cancer, lung cancer, endometrial cancer, bone cancer, testicular cancer, skin cancer, kidney cancer, stomach cancer, esophageal cancer, head and neck cancer, salivary gland cancer, and myeloma. In certain embodiments, the present invention includes methods to treat or inhibit the growth of a cancer including, but not limited to, hepatocellular carcinoma, non-small cell lung cancer, head and neck squamous cell cancer, basal cell carcinoma, cutaneous squamous cell carcinoma, chondrosarcoma, angiosarcoma, cholangiocarcinoma, soft tissue sarcoma, colorectal cancer, melanoma, Merkel cell carcinoma, and glioblastoma multiforme. In certain embodiments, the present invention includes methods to treat advanced solid tumors including but not limited to, metastatic cutaneous squamous cell carcinoma (CSCC), unresectable locally advanced CSCC, metastatic colorectal cancer, advanced or metastatic hepatocellular cancer, advanced non-small cell lung cancer, recurrent glioblastoma multiforme, newly diagnosed glioblastoma multiforme, castrate recurrent prostate cancer and any advanced solid tumor refractory to first-line therapy.

According to one aspect, the present invention includes methods to treat or inhibit the growth of a tumor, the methods comprising: (a) selecting a patient with cutaneous squamous cell carcinoma (CSCC) wherein the patient is selected based on an attribute selected from the group consisting of: (i) the patient has locally advanced CSCC; (ii) the patient has metastatic CSCC; (iii) the tumor is unresectable; (iv) the patient has been earlier treated with at least one anti-tumor therapy; (v) the patient has disease that is considered inoperable; (vi) surgery and/or radiation is contraindicated; (vii) the patient has been earlier treated with radiation and the tumor is resistant or unresponsive to radiation; and (viii) the tumor comprises uv-induced DNA damage; and (b) administering a therapeutically effective amount of an anti-PD-1 antibody to the patient in need thereof. In certain embodiments, one or more doses of the anti-PD-1 antibody are administered 1-12 weeks after the immediately preceding dose, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 weeks after the immediately preceding dose. In certain embodiments, each dose of the anti-PD-1 antibody comprises 0.1, 1, 0.3, 3, 4, 5, 6, 7, 8, 9 or 10 mg/kg of the patient's body weight. In certain embodiments, each dose comprises 50-500 mg of the anti-PD-1 antibody. In one embodiment, the anti-PD-1 antibody is REGN2810.

According to one aspect, the present invention includes methods of treating a tumor or increasing the survival of a patient with cancer, the methods comprising: (a) selecting a patient with lung cancer, wherein the patient is selected on the basis of an attribute selected from the group consisting of: (i) the patient has non-small cell lung cancer; (ii) tumor tissue in the patient expresses PD-L1 in <50% of tumor cells; (iii) the patient has squamous or non-squamous stage III or IV lung cancer; (iv) the patient has received no prior systemic treatment for recurrent lung cancer; and (v) the patient has received prior treatment with an anti-tumor therapy; and (b) administering one or more doses of a therapeutically effective amount of an antibody or antigen-binding fragment thereof that binds specifically to PD-1 to the patient. In one embodiment, the patient has advanced or recurrent non-small cell lung cancer, tumor tissue in the patient expresses PD-L1 in <50% of tumor cells, and has not been previously treated with a systemic treatment for lung cancer. In one embodiment, the patient has advanced or recurrent non-small cell lung cancer, tumor tissue in the patient expresses PD-L1 in <50% of tumor cells, and has been previously treated with a systemic treatment for lung cancer (e.g., chemotherapy). In certain embodiments, the patient has advanced or recurrent non-small cell lung cancer, and tumor tissue in the patient expresses PD-L1 in ≤50%, ≤45%, ≤40%, ≤30%, ≤20%, ≤10%, ≤5%, ≤2%, or ≤1% of tumor cells.

In certain embodiments, the present invention includes methods of treating a cancer or increasing the survival of a patient with cancer, the methods comprising: (a) selecting a patient with lung cancer wherein tumor tissue in the patient expresses PD-L1 in ≥50% of tumor cells; and (b) administering one or more doses of a therapeutically effective amount of an antibody or antigen-binding fragment thereof that specifically binds PD-1 to the patient. In one embodiment, tumor tissue in the patient expresses PD-L1 in ≥60%, ≥70%, ≥80%, or ≥90% of tumor cells. In one embodiment, the patient has advanced or metastatic non-small cell lung cancer. In one embodiment, the patient has squamous or non-squamous stage III or stage IV non-small cell lung cancer. In one embodiment, the patient has not been previously treated with a systemic treatment for lung cancer.

According to one aspect, the present invention includes methods for treating a cancer or increasing the survival of a patient with cancer, the methods comprising: (a) selecting a patient with lung cancer, wherein the patient has at least one of the following attributes: (i) the patient has advanced or metastatic non-small cell lung cancer; (ii) the patient has squamous or non-squamous stage III or stage IV lung cancer; (iii) the patient has not been previously treated with a systemic treatment for lung cancer; and (iv) the patient has been previously treated with an anti-tumor therapy (e.g., platinum-based chemotherapy, surgery and/or radiation); (b) determining the expression of PD-L1 in the tumor tissue; and (c) administering one or more doses of a therapeutically effective amount of an antibody or antigen-binding fragment thereof that specifically binds PD-1 to the patient, if tumor tissue expresses PD-L1 in <50% of tumor cells. In one embodiment, the tumor tissue expresses PD-L1 in <50%, ≤45%, ≤40%, ≤30%, ≤20%, ≤10%, ≤5%, ≤2%, ≤1% or 0% of tumor cells.

According to one aspect, the present invention includes methods for treating a cancer or increasing the survival of a patient with cancer, the methods comprising: (a) selecting a patient with lung cancer, wherein the patient has at least one of the following attributes: (i) the patient has advanced or metastatic non-small cell lung cancer; (ii) the patient has squamous or non-squamous stage III or stage IV lung cancer; (iii) the patient has not been previously treated with a systemic treatment for lung cancer; and (iv) the patient has been previously treated with an anti-tumor therapy (e.g., platinum-based chemotherapy, surgery and/or radiation); (b) determining the expression of PD-L1 in the tumor tissue; and (c) administering one or more doses of a therapeutically effective amount of an antibody or antigen-binding fragment thereof that specifically binds PD-1 to the patient, if the tumor tissue expresses PD-L1 in ≥50% of tumor cells. In one embodiment, the tumor tissue expresses PD-L1 in ≥60%, ≥70%, ≥80%, or ≥90% of tumor cells.

In certain embodiments, each dose of the anti-PD-1 antibody is administered 1 week, 2 weeks, 3 weeks, or 4 weeks after the immediately preceding dose, wherein each dose comprises 20-1500 mg of the anti-PD-1 antibody. In one embodiment, each dose comprises 200, 250, 300, 350, 500, 600, 700, 800, 900, 1000 or 1050 mg of the anti-PD-1 antibody. In one embodiment, the anti-PD-1 antibody is REGN2810 (cemiplimab).

In certain embodiments, the methods comprise administering one or more doses of a therapeutically effective amount of an anti-PD-1 antibody to a patient with cancer wherein the patient is selected on the basis of PD-L1 expression in less than 1% of tumor cells. In certain embodiments, tumor tissue in the patient expresses PD-L1 in less than 2%, less than 5%, less than 10%, less than 20%, less than 30%, less than 40%, or less than 50% of tumor cells. In certain embodiments, the methods comprise selecting a patient with cancer wherein the patient is selected on the basis of PD-L1 expression in ≥50% of tumor cells and administering one or more doses of a therapeutically effective amount of an anti-PD-1 antibody to the patient. In certain embodiments, the expression of PD-L1 in tumor tissue is determined by any assay known in the art, for example, by an ELISA assay or by an immunohistochemistry (IHC) assay, as described in PCT publications WO2016124558 or WO2016191751 or US Patent Application Publication US20160305947. In certain embodiments, the expression of PD-L1 is determined by quantitating RNA expression, for example, by in situ hybridization or by RT-PCR. In certain embodiments, the expression of PD-L1 is determined by imaging with a labeled anti-PD-L1 antibody, for example, by immuno-positron emission tomography or iPET [See, e.g., The Oncologist, 12: 1379 (2007); Journal of Nuclear Medicine, 52(8): 1171 (2011); U.S. Provisional Patent Application No. 62/428,672, filed Dec. 1, 2016].

In certain embodiments, the administration of at least one dose of the anti-PD-1 antibody results in increasing the progression-free survival (PFS) or overall survival (OS) of the patient as compared to a patient who has been administered platinum-based chemotherapy as monotherapy. In certain embodiments, the PFS is increased by at least one month, about 2 months, about 3 months, about 4 months, about 5 months, about 6 months, about 7 months, about 8 months, about 9 months, about 10 months, about 11 months, about 1 year, about 2 years, about 3 years or more as compared to a patient administered with platinum-based chemotherapy. In certain embodiments, the OS is increased by at least one month, about 2 months, about 3 months, about 4 months, about 5 months, about 6 months, about 7 months, about 8 months, about 9 months, about 10 months, about 11 months, about 1 year, about 2 years, about 3 years or more as compared to a patient administered with platinum-based chemotherapy.

According to one aspect, the present invention includes methods to treat or inhibit the growth of a tumor, the methods comprising selecting a subject with a brain cancer and administering a therapeutically effective amount of an anti-PD-1 antibody or antigen-binding fragment thereof to the subject in need thereof. In certain embodiments, the brain cancer is glioblastoma multiforme. In one embodiment, the subject has newly diagnosed glioblastoma multiforme. In one embodiment, the subject is ≥65 years of age. In one embodiment, the anti-PD-1 antibody is administered as one or more doses, wherein each dose is administered 0.5 to 4 weeks after the immediately preceding dose. In one embodiment, each dose of the anti-PD-1 antibody comprises 1, 3 or 10 mg/kg of the subject's body weight. In certain embodiments, the anti-PD-1 antibody is administered in combination with radiation therapy. In one embodiment, the radiation therapy is hypofractionated radiation therapy. In one embodiment, the subject is administered 20-60 Gy in 2-20 fractions. In certain embodiments, the one or more doses of anti-PD-1 antibody are comprised in one or more cycles of treatment, wherein each cycle of treatment comprises 1-6 doses of the anti-PD-1 antibody. In one embodiment, at least one cycle of treatment further comprises radiation therapy. In a further embodiment, the radiation therapy is hypofractionated radiation therapy. In certain embodiments, the subject is administered hypofractionated radiation therapy in the first cycle of treatment, wherein the hypofractionated radiation therapy comprises 20-60 Gy in 2-20 fractions. In one embodiment, the subject is administered hypofractionated radiation therapy one week after the administration of the anti-PD-1 antibody in the first cycle of treatment. In certain embodiments, the methods of the present invention further comprise administering an anti-angiogenic agent to the subject if the subject develops intracranial edema following administration of the anti-PD-1 antibody. In one embodiment, the anti-angiogenic agent is a vascular endothelial growth factor (VEGF) inhibitor. In one embodiment, the anti-angiogenic agent is an angiopoietin-2 (Ang-2) inhibitor (e.g., an anti-Ang-2 antibody such as nesvacumab). In certain embodiments, the VEGF inhibitor is selected from the group consisting of a VEGF-inhibiting fusion protein (e.g., a “VEGF-Trap” such as aflibercept or other VEGF-inhibiting fusion protein as set forth in U.S. Pat. No. 7,087,411), an anti-VEGF antibody (e.g., bevacizumab), and a small molecule kinase inhibitor of VEGF receptor (e.g., sunitinib, sorafenib, or pazopanib).

The methods of the present invention, according to certain embodiments, comprise administering to a subject a therapeutically effective amount of an anti-PD-1 antibody in combination with an additional therapeutic agent or therapeutic regimen or procedure. The additional therapeutic agent or therapeutic regimen or procedure may be administered for increasing anti-tumor efficacy, for reducing toxic effects of one or more therapies and/or reducing the dosage of one or more therapies. In various embodiments, the additional therapeutic agent or therapeutic regimen or procedure is selected from the group consisting of, e.g., chemotherapy, cyclophosphamide, surgery, radiation, a cancer vaccine, a programmed death ligand 1 (PD-L1) inhibitor (e.g., an anti-PD-L1 antibody), a lymphocyte activation gene 3 (LAG3) inhibitor (e.g., an anti-LAG3 antibody), a cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) inhibitor (e.g., an anti-CTLa-4 antibody such as ipilimumab), a glucocorticoid-induced tumor necrosis factor receptor (GITR) inhibitor (e.g., an anti-GITR antibody), a T-cell immunoglobulin and mucin containing-3 (TIM3) inhibitor, a B- and T-lymphocyte attenuator (BTLA) inhibitor, a T cell immunoreceptor with Ig and ITIM domains (TIGIT) inhibitor, a CD47 inhibitor, an indoleamine-2,3-dioxygenase (IDO) inhibitor, a vascular endothelial growth factor (VEGF) antagonist [selected from the group consisting of a VEGF-inhibiting fusion protein (e.g., a “VEGF-Trap” such as aflibercept or other VEGF-inhibiting fusion protein as set forth in U.S. Pat. No. 7,087,411), an anti-VEGF antibody (e.g., bevacizumab), and a small molecule kinase inhibitor of VEGF receptor (e.g., sunitinib, sorafenib, or pazopanib)], an angiopoietin-2 (Ang2) inhibitor, a transforming growth factor beta (TGFβ) inhibitor, an epidermal growth factor receptor (EGFR) inhibitor, an antibody to a tumor-specific antigen [e.g., CA9, CA125, melanoma-associated antigen 3 (MAGE3), carcinoembryonic antigen (CEA), vimentin, tumor-M2-PK, prostate-specific antigen (PSA), mucin-1, MART-1, and CA19-9], an anti-CD3/anti-CD20 bispecific antibody, a vaccine (e.g., Bacillus Calmette-Guerin), granulocyte-macrophage colony-stimulating factor, a cytotoxin, a chemotherapeutic agent, an IL-6R inhibitor, an IL-4R inhibitor, an IL-10 inhibitor, a cytokine such as IL-2, IL-7, IL-21, and IL-15, a T-cell therapy, an anti-inflammatory drug such as corticosteroids, and non-steroidal anti-inflammatory drugs, and a dietary supplement such as anti-oxidants. In certain embodiments, the anti-PD-1 antibody may be administered in combination with therapy including a chemotherapeutic agent, and surgery. As used herein, the phrase ‘in combination with” means that the anti-PD-1 antibody is administered to the subject at the same time as, just before, orjust after administration of radiation therapy and the additional therapeutic agent. In certain embodiments, the additional therapeutic agent is administered as a co-formulation with the anti-PD-1 antibody.

In certain embodiments, the present invention includes methods for treating large tumors or advanced malignancies, the methods comprising administering to a subject in need thereof an anti-PD-1 antibody in combination with radiation therapy and an additional therapeutic agent, wherein the additional therapeutic agent is administered to overcome regulatory T cell (Treg)-mediated immunosuppression. In certain embodiments, the additional therapeutic agent is selected from the group consisting of an anti-GITR antibody, an anti-LAG3 antibody, cyclophosphamide, and GM-CSF.

As used herein, the term “large tumor” refers to the size of the tumor. It typically correlates with higher tumor burden or tumor load. In certain embodiments, it correlates with stage of the disease, e.g., advanced malignancy. In certain embodiments, it correlates with increased probability of metastasis.

In certain embodiments, the present invention includes methods comprising administering one or more doses of an anti-PD-1 antibody in combination with radiation therapy and a sub-therapeutic dose of cyclophosphamide. As used herein, a sub-therapeutic dose of cyclophosphamide (also referred to herein as “low-dose cyclophosphamide”) means an amount of cyclophosphamide that by itself does not impart a therapeutic effect and preferably does not cause toxicity. Exemplary doses of cyclophosphamide that are considered “sub-therapeutic” in the context of the present invention include 100 mg/m2, 90 mg/m2, 80 mg/m2, or less.

In certain embodiments, the radiation therapy is administered to a first tumor lesion, but not to a second tumor lesion, wherein the administration in combination with the anti-PD-1 antibody leads to tumor regression in both the first and second tumor lesions (abscopal effect). In certain embodiments, the methods of the present invention comprise administering an anti-PD-1 antibody in combination with radiation therapy to generate prolonged abscopal effect.

In certain embodiments, the methods of the present invention comprise administering to a subject in need thereof a therapeutically effective amount of an anti-PD-1 antibody, optionally, in combination with a second anti-tumor therapy, wherein administration of the combination leads to increased inhibition of tumor growth. In certain embodiments, tumor growth is inhibited by at least about 10%, about 20%, about 30%, about 40%, about 50%, about 60%, about 70% or about 80% as compared to an untreated subject or a subject administered with either the antibody or the second anti-tumor therapy as monotherapy. In certain embodiments, the administration of an anti-PD-1 antibody and/or the second anti-tumor therapy leads to increased tumor regression, tumor shrinkage and/or disappearance. In certain embodiments, the administration of an anti-PD-1 antibody and/or chemotherapy leads to delay in tumor growth and development, e.g., tumor growth may be delayed by about 3 days, more than 3 days, about 7 days, more than 7 days, more than 15 days, more than 1 month, more than 3 months, more than 6 months, more than 1 year, more than 2 years, or more than 3 years as compared to an untreated subject or a subject treated with either antibody or chemotherapy as monotherapy. In certain embodiments, administration of an anti-PD-1 antibody in combination with a second anti-tumor therapy (e.g., chemotherapy) prevents tumor recurrence and/or increases duration of survival of the subject, e.g., increases duration of survival by more than 15 days, more than 1 month, more than 3 months, more than 6 months, more than 12 months, more than 18 months, more than 24 months, more than 36 months, or more than 48 months than an untreated subject or a subject which is administered either the antibody or the second anti-tumor therapy as monotherapy. In certain embodiments, administration of the anti-PD-1 antibody in combination with an additional anti-tumor therapy increases progression-free survival or overall survival. In certain embodiments, administration of an anti-PD-1 antibody in combination with chemotherapy increases response and duration of response in a subject, e.g., by more than 2%, more than 3%, more than 4%, more than 5%, more than 6%, more than 7%, more than 8%, more than 9%, more than 10%, more than 20%, more than 30%, more than 40% or more than 50% over an untreated subject or a subject which has received either antibody or chemotherapy as monotherapy. In certain embodiments, administration of an anti-PD-1 antibody and/or a second anti-tumor therapy to a subject with a cancer leads to complete disappearance of all evidence of tumor cells (“complete response”). In certain embodiments, administration of an anti-PD-1 antibody and/or a second anti-tumor therapy to a subject with a cancer leads to at least 30% or more decrease in tumor cells or tumor size (“partial response”). In certain embodiments, administration of an anti-PD-1 antibody and/or a second anti-tumor therapy to a subject with a cancer leads to complete or partial disappearance of tumor cells/lesions including new measurable lesions. Tumor reduction can be measured by any of the methods known in the art, e.g., X-rays, positron emission tomography (PET), computed tomography (CT), magnetic resonance imaging (MRI), cytology, histology, or molecular genetic analyses.

In certain embodiments, the methods of the present invention comprise administering to a subject in need thereof a therapeutically effective amount of an anti-PD-1 antibody, wherein administration of the anti-PD-1 antibody leads to increased overall survival (OS) or progression-free survival (PFS) of the patient as compared to a patient administered with a ‘standard-of-care’ therapy (e.g., chemotherapy, surgery or radiation). In certain embodiments, the PFS is increased by at least one month, about 2 months, about 3 months, about 4 months, about 5 months, about 6 months, about 7 months, about 8 months, about 9 months, about 10 months, about 11 months, about 1 year, about 2 years, about 3 years or more as compared to a patient administered with platinum-based chemotherapy. In certain embodiments, the OS is increased by at least one month, about 2 months, about 3 months, about 4 months, about 5 months, about 6 months, about 7 months, about 8 months, about 9 months, about 10 months, about 11 months, about 1 year, about 2 years, about 3 years or more as compared to a patient administered with platinum-based chemotherapy.

Methods for Suppressing T Regulatory Cells

According to certain aspects, the present invention provides methods for suppressing or inhibiting the activation and/or proliferation of T regulatory (Treg) cells. In certain embodiments, the present invention provides methods for suppressing the activity of Treg cells. The methods, according to these aspects, comprise selecting a subject with a solid tumor and administering to the subject an anti-PD-1 antibody or antigen-binding fragment thereof in combination with at least one of (i) radiation therapy, and (ii) a glucocorticoid-induced tumor necrosis factor receptor (GITR) antagonist. In certain embodiments, the methods comprise administering to a subject in need thereof an anti-PD-1 antibody or antigen-binding fragment thereof in combination with radiation therapy and a GITR antagonist.

In certain embodiments, the GITR antagonist is an anti-GITR antibody or antigen-binding fragment thereof. According to certain exemplary embodiments of the present invention, the anti-GITR antibody, or antigen-binding fragment thereof comprises a heavy chain variable region (HCVR), light chain variable region (LCVR), and/or complementarity determining regions (CDRs) comprising the amino acid sequences of any of the anti-GITR antibodies as set forth in U.S. Ser. No. 62/256,922 (filed Nov. 18, 2015), the contents of which are incorporated herein in their entirety. Other anti-GITR antibodies that can be used in the context of the methods of the present invention include any of the anti-GITR antibodies as set forth in e.g., U.S. Pat. Nos. 9,228,016, 8,709,424, 8,591,886, 7,812,135, or US Patent Publication No. 20150368349.

In certain embodiments, the present invention provides methods for suppressing or eliminating Treg activity, the methods comprising administering to a subject in need thereof an anti-PD-1 antibody or antigen-binding fragment thereof in combination with one or more doses of radiation and a cytotoxic T-lymphocyte antigen-4 (CTLA) antagonist. In certain embodiments, the CTLA antagonist is an anti-CTLA antibody (e.g., ipilimumab).

In certain embodiments, the present invention provides methods for suppressing or eliminating Treg activity, the methods comprising administering to a subject in need thereof an anti-PD-1 antibody or antigen-binding fragment thereof in combination with one or more doses of radiation and a lymphocyte activation gene 3 (LAG-3) antagonist. In certain embodiments, the LAG-3 antagonist is an anti-LAG-3 antibody. Anti-LAG-3 antibodies that can be used in the context of the methods of the present invention are disclosed in U.S. Ser. No. 62/239,524 (filed Oct. 9, 2015), the contents of which are incorporated herein in their entirety

In certain embodiments, the present invention provides methods for suppressing or eliminating Treg activity, the methods comprising administering to a subject in need thereof an anti-PD-1 antibody or antigen-binding fragment thereof in combination with one or more doses of radiation and cyclophosphamide.

In one aspect, the methods of the present invention comprise administration of an anti-PD-1 antibody in combination with radiation therapy and an additional therapeutic agent selected from the group consisting of a GITR antagonist, an anti-LAG-3 antibody, and cyclophosphamide to a subject with a solid tumor, wherein the administration results in an effect selected from the group consisting of inhibition of tumor growth, reduction in the size of a tumor, delay in tumor growth, inhibition of tumor metastasis, reduction in metastatic lesions over time, reduced use of chemotherapeutic or cytotoxic agents, increased survival, complete response, partial response, and stable disease. In certain embodiments, the administration results in reduction of tumor burden in the subject. In certain embodiments, the subject has a large tumor. As defined elsewhere herein, the term “large tumor” refers to the size of the tumor and is correlated with increased tumor burden and increased probability of occurrence of metastasis. In certain embodiments, the term refers to an advanced malignancy.

Anti-PD-1 Antibodies and Antigen-Binding Fragments Thereof

According to certain exemplary embodiments of the present invention, the methods comprise administering a therapeutically effective amount of an anti-PD-1 antibody or antigen-binding fragment thereof. The term “antibody,” as used herein, includes immunoglobulin molecules comprising four polypeptide chains, two heavy (H) chains and two light (L) chains inter-connected by disulfide bonds, as well as multimers thereof (e.g., IgM). In a typical antibody, each heavy chain comprises a heavy chain variable region (abbreviated herein as HCVR or V_(H)) and a heavy chain constant region. The heavy chain constant region comprises three domains, C_(H)1, C_(H)2 and C_(H)3. Each light chain comprises a light chain variable region (abbreviated herein as LCVR or V_(L)) and a light chain constant region. The light chain constant region comprises one domain (C_(L)1). The V_(H) and V_(L) regions can be further subdivided into regions of hypervariability, termed complementarity determining regions (CDRs), interspersed with regions that are more conserved, termed framework regions (FR). Each V_(H) and V_(L) is composed of three CDRs and four FRs, arranged from amino-terminus to carboxy-terminus in the following order: FR1, CDR1, FR2, CDR2, FR3, CDR3, FR4. In different embodiments of the invention, the FRs of the anti-IL-4R antibody (or antigen-binding portion thereof) may be identical to the human germline sequences, or may be naturally or artificially modified. An amino acid consensus sequence may be defined based on a side-by-side analysis of two or more CDRs.

The term “antibody,” as used herein, also includes antigen-binding fragments of full antibody molecules. The terms “antigen-binding portion” of an antibody, “antigen-binding fragment” of an antibody, and the like, as used herein, include any naturally occurring, enzymatically obtainable, synthetic, or genetically engineered polypeptide or glycoprotein that specifically binds an antigen to form a complex. Antigen-binding fragments of an antibody may be derived, e.g., from full antibody molecules using any suitable standard techniques such as proteolytic digestion or recombinant genetic engineering techniques involving the manipulation and expression of DNA encoding antibody variable and optionally constant domains. Such DNA is known and/or is readily available from, e.g., commercial sources, DNA libraries (including, e.g., phage-antibody libraries), or can be synthesized. The DNA may be sequenced and manipulated chemically or by using molecular biology techniques, for example, to arrange one or more variable and/or constant domains into a suitable configuration, or to introduce codons, create cysteine residues, modify, add or delete amino acids, etc.

Non-limiting examples of antigen-binding fragments include: (i) Fab fragments; (ii) F(ab′)2 fragments; (iii) Fd fragments; (iv) Fv fragments; (v) single-chain Fv (scFv) molecules; (vi) dAb fragments; and (vii) minimal recognition units consisting of the amino acid residues that mimic the hypervariable region of an antibody (e.g., an isolated complementarity determining region (CDR) such as a CDR3 peptide), or a constrained FR3-CDR3-FR4 peptide. Other engineered molecules, such as domain-specific antibodies, single domain antibodies, domain-deleted antibodies, chimeric antibodies, CDR-grafted antibodies, diabodies, triabodies, tetrabodies, minibodies, nanobodies (e.g. monovalent nanobodies, bivalent nanobodies, etc.), small modular immunopharmaceuticals (SMIPs), and shark variable IgNAR domains, are also encompassed within the expression “antigen-binding fragment,” as used herein.

An antigen-binding fragment of an antibody will typically comprise at least one variable domain. The variable domain may be of any size or amino acid composition and will generally comprise at least one CDR which is adjacent to or in frame with one or more framework sequences. In antigen-binding fragments having a V_(H) domain associated with a V_(L) domain, the V_(H) and V_(L) domains may be situated relative to one another in any suitable arrangement. For example, the variable region may be dimeric and contain V_(H)-V_(H), V_(H)-V_(L) or V_(L)-V_(L) dimers. Alternatively, the antigen-binding fragment of an antibody may contain a monomeric V_(H) or V_(L) domain.

In certain embodiments, an antigen-binding fragment of an antibody may contain at least one variable domain covalently linked to at least one constant domain. Non-limiting, exemplary configurations of variable and constant domains that may be found within an antigen-binding fragment of an antibody of the present invention include: (i) V_(H)-C_(H)1; (ii) V_(H)-C_(H)2; (iii) V_(H)-C_(H)3; (iv) V_(H)-C_(H)1-C_(H)2; (v) V_(H)-C_(H)1-C_(H)2-C_(H)3; (vi) V_(H)-C_(H)2-C_(H)3; (vii) V_(H)-C_(L); (viii) V_(L)-C_(H)1; (ix) V_(L)-C_(H)2; (x) V_(L)-C_(H)3; (xi) V_(L)-C_(H)1-C_(H)2; (xii) V_(L)-C_(H)I-C_(H)2-C_(H)3; (xiii) V_(L)-C_(H)2-C_(H)3; and (xiv) V_(L)-C_(L). In any configuration of variable and constant domains, including any of the exemplary configurations listed above, the variable and constant domains may be either directly linked to one another or may be linked by a full or partial hinge or linker region. A hinge region may consist of at least 2 (e.g., 5, 10, 15, 20, 40, 60 or more) amino acids which result in a flexible or semi-flexible linkage between adjacent variable and/or constant domains in a single polypeptide molecule. Moreover, an antigen-binding fragment of an antibody of the present invention may comprise a homo-dimer or hetero-dimer (or other multimer) of any of the variable and constant domain configurations listed above in non-covalent association with one another and/or with one or more monomeric V_(H) or V_(L) domain (e.g., by disulfide bond(s)).

The term “antibody,” as used herein, also includes multispecific (e.g., bispecific) antibodies. A multispecific antibody or antigen-binding fragment of an antibody will typically comprise at least two different variable domains, wherein each variable domain is capable of specifically binding to a separate antigen or to a different epitope on the same antigen. Any multispecific antibody format may be adapted for use in the context of an antibody or antigen-binding fragment of an antibody of the present invention using routine techniques available in the art. For example, the present invention includes methods comprising the use of bispecific antibodies wherein one arm of an immunoglobulin is specific for PD-1 or a fragment thereof, and the other arm of the immunoglobulin is specific for a second therapeutic target or is conjugated to a therapeutic moiety. Exemplary bispecific formats that can be used in the context of the present invention include, without limitation, e.g., scFv-based or diabody bispecific formats, IgG-scFv fusions, dual variable domain (DVD)-Ig, Quadroma, knobs-into-holes, common light chain (e.g., common light chain with knobs-into-holes, etc.), CrossMab, CrossFab, (SEED) body, leucine zipper, Duobody, IgG1/IgG2, dual acting Fab (DAF)-IgG, and Mab² bispecific formats (see, e.g., Klein et al. 2012, mAbs 4:6, 1-11, and references cited therein, for a review of the foregoing formats). Bispecific antibodies can also be constructed using peptide/nucleic acid conjugation, e.g., wherein unnatural amino acids with orthogonal chemical reactivity are used to generate site-specific antibody-oligonucleotide conjugates which then self-assemble into multimeric complexes with defined composition, valency and geometry. (See, e.g., Kazane et al., J. Am. Chem. Soc. [Epub: Dec. 4, 2012]).

The antibodies used in the methods of the present invention may be human antibodies. The term “human antibody,” as used herein, is intended to include antibodies having variable and constant regions derived from human germline immunoglobulin sequences. The human antibodies of the invention may nonetheless include amino acid residues not encoded by human germline immunoglobulin sequences (e.g., mutations introduced by random or site-specific mutagenesis in vitro or by somatic mutation in vivo), for example in the CDRs and in particular CDR3. However, the term “human antibody,” as used herein, is not intended to include antibodies in which CDR sequences derived from the germline of another mammalian species, such as a mouse, have been grafted onto human framework sequences.

The antibodies used in the methods of the present invention may be recombinant human antibodies. The term “recombinant human antibody,” as used herein, is intended to include all human antibodies that are prepared, expressed, created or isolated by recombinant means, such as antibodies expressed using a recombinant expression vector transfected into a host cell (described further below), antibodies isolated from a recombinant, combinatorial human antibody library (described further below), antibodies isolated from an animal (e.g., a mouse) that is transgenic for human immunoglobulin genes [see e.g., Taylor et al. (1992) Nucl. Acids Res. 20:6287-6295] or antibodies prepared, expressed, created or isolated by any other means that involves splicing of human immunoglobulin gene sequences to other DNA sequences. Such recombinant human antibodies have variable and constant regions derived from human germline immunoglobulin sequences. In certain embodiments, however, such recombinant human antibodies are subjected to in vitro mutagenesis (or, when an animal transgenic for human Ig sequences is used, in vivo somatic mutagenesis) and thus the amino acid sequences of the V_(H) and V_(L) regions of the recombinant antibodies are sequences that, while derived from and related to human germline V_(H) and V_(L) sequences, may not naturally exist within the human antibody germline repertoire in vivo.

According to certain embodiments, the antibodies used in the methods of the present invention specifically bind PD-1. The term “specifically binds,” or the like, means that an antibody or antigen-binding fragment thereof forms a complex with an antigen that is relatively stable under physiologic conditions. Methods for determining whether an antibody specifically binds to an antigen are well known in the art and include, for example, equilibrium dialysis, surface plasmon resonance, and the like. For example, an antibody that “specifically binds” PD-1, as used in the context of the present invention, includes antibodies that bind PD-1 or portion thereof with a K_(D) of less than about 500 nM, less than about 300 nM, less than about 200 nM, less than about 100 nM, less than about 90 nM, less than about 80 nM, less than about 70 nM, less than about 60 nM, less than about 50 nM, less than about 40 nM, less than about 30 nM, less than about 20 nM, less than about 10 nM, less than about 5 nM, less than about 4 nM, less than about 3 nM, less than about 2 nM, less than about 1 nM or less than about 0.5 nM, as measured in a surface plasmon resonance assay. An isolated antibody that specifically binds human PD-1 may, however, have cross-reactivity to other antigens, such as PD-1 molecules from other (non-human) species.

According to certain exemplary embodiments of the present invention, the anti-PD-1 antibody, or antigen-binding fragment thereof comprises a heavy chain variable region (HCVR), light chain variable region (LCVR), and/or complementarity determining regions (CDRs) comprising the amino acid sequences of any of the anti-PD-1 antibodies as set forth in US Patent Publication No. 20150203579, hereby incorporated in its entirety. In certain exemplary embodiments, the anti-PD-1 antibody or antigen-binding fragment thereof that can be used in the context of the methods of the present invention comprises the heavy chain complementarity determining regions (HCDRs) of a heavy chain variable region (HCVR) comprising the amino acid sequence of SEQ ID NO: 1 and the light chain complementarity determining regions (LCDRs) of a light chain variable region (LCVR) comprising the amino acid sequence of SEQ ID NO: 2. According to certain embodiments, the anti-PD-1 antibody or antigen-binding fragment thereof comprises three HCDRs (HCDR1, HCDR2 and HCDR3) and three LCDRs (LCDR1, LCDR2 and LCDR3), wherein the HCDR1 comprises the amino acid sequence of SEQ ID NO: 3; the HCDR2 comprises the amino acid sequence of SEQ ID NO: 4; the HCDR3 comprises the amino acid sequence of SEQ ID NO: 5; the LCDR1 comprises the amino acid sequence of SEQ ID NO: 6; the LCDR2 comprises the amino acid sequence of SEQ ID NO: 7; and the LCDR3 comprises the amino acid sequence of SEQ ID NO: 8. In yet other embodiments, the anti-PD-1 antibody or antigen-binding fragment thereof comprises an HCVR comprising SEQ ID NO: 1 and an LCVR comprising SEQ ID NO: 2. In certain embodiments, the methods of the present invention comprise the use of an anti-PD-1 antibody, wherein the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 9. In some embodiments, the anti-PD-1 antibody comprises a light chain comprising the amino acid sequence of SEQ ID NO: 10. An exemplary antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 9 and a light chain comprising the amino acid sequence of SEQ ID NO: 10 is the fully human anti-PD-1 antibody known as REGN2810 (also known as cemiplimab). According to certain exemplary embodiments, the methods of the present invention comprise the use of REGN2810, or a bioequivalent thereof. The term “bioequivalent”, as used herein, refers to anti-PD-1 antibodies or PD-1-binding proteins or fragments thereof that are pharmaceutical equivalents or pharmaceutical alternatives whose rate and/or extent of absorption do not show a significant difference with that of REGN2810 when administered at the same molar dose under similar experimental conditions, either single dose or multiple dose. In the context of the invention, the term refers to antigen-binding proteins that bind to PD-1 which do not have clinically meaningful differences with REGN2810 in their safety, purity and/or potency.

Other anti-PD-1 antibodies that can be used in the context of the methods of the present invention include, e.g., the antibodies referred to and known in the art as nivolumab (U.S. Pat. No. 8,008,449), pembrolizumab (U.S. Pat. No. 8,354,509), MED10608 (U.S. Pat. No. 8,609,089), pidilizumab (U.S. Pat. No. 8,686,119), or any of the anti-PD-1 antibodies as set forth in U.S. Pat. Nos. 6,808,710, 7,488,802, 8,168,757, 8,354,509, 8,779,105, or 8,900,587.

The anti-PD-1 antibodies used in the context of the methods of the present invention may have pH-dependent binding characteristics. For example, an anti-PD-1 antibody for use in the methods of the present invention may exhibit reduced binding to PD-1 at acidic pH as compared to neutral pH. Alternatively, an anti-PD-1 antibody of the invention may exhibit enhanced binding to its antigen at acidic pH as compared to neutral pH. The expression “acidic pH” includes pH values less than about 6.2, e.g., about 6.0, 5.95, 5.9, 5.85, 5.8, 5.75, 5.7, 5.65, 5.6, 5.55, 5.5, 5.45, 5.4, 5.35, 5.3, 5.25, 5.2, 5.15, 5.1, 5.05, 5.0, or less. As used herein, the expression “neutral pH” means a pH of about 7.0 to about 7.4. The expression “neutral pH” includes pH values of about 7.0, 7.05, 7.1, 7.15, 7.2, 7.25, 7.3, 7.35, and 7.4.

In certain instances, “reduced binding to PD-1 at acidic pH as compared to neutral pH” is expressed in terms of a ratio of the K_(D) value of the antibody binding to PD-1 at acidic pH to the K_(D) value of the antibody binding to PD-1 at neutral pH (or vice versa). For example, an antibody or antigen-binding fragment thereof may be regarded as exhibiting “reduced binding to PD-1 at acidic pH as compared to neutral pH” for purposes of the present invention if the antibody or antigen-binding fragment thereof exhibits an acidic/neutral K_(D) ratio of about 3.0 or greater. In certain exemplary embodiments, the acidic/neutral K_(D) ratio for an antibody or antigen-binding fragment of the present invention can be about 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0, 6.5, 7.0, 7.5, 8.0, 8.5, 9.0, 9.5, 10.0, 10.5, 11.0, 11.5, 12.0, 12.5, 13.0, 13.5, 14.0, 14.5, 15.0, 20.0, 25.0, 30.0, 40.0, 50.0, 60.0, 70.0, 100.0, or greater.

Antibodies with pH-dependent binding characteristics may be obtained, e.g., by screening a population of antibodies for reduced (or enhanced) binding to a particular antigen at acidic pH as compared to neutral pH. Additionally, modifications of the antigen-binding domain at the amino acid level may yield antibodies with pH-dependent characteristics. For example, by substituting one or more amino acids of an antigen-binding domain (e.g., within a CDR) with a histidine residue, an antibody with reduced antigen-binding at acidic pH relative to neutral pH may be obtained. As used herein, the expression “acidic pH” means a pH of 6.0 or less.

Combination Therapies

The methods of the present invention, according to certain embodiments, comprise administering to the subject an additional anti-tumor therapy in combination with an anti-PD-1 antibody. In certain embodiments, the methods of the present invention comprise administering radiation therapy or chemotherapy in combination with an anti-PD-1 antibody for additive or synergistic activity to treat cancer. As used herein, the expression “in combination with” means that the additional anti-tumor therapy is administered before, after, or concurrent with the anti-PD-1 antibody. The term “in combination with” also includes sequential or concomitant administration of anti-PD-1 antibody and the additional anti-tumor therapy. For example, when administered “before” the additional anti-tumor therapy, the anti-PD-1 antibody may be administered more than 150 hours, about 150 hours, about 100 hours, about 72 hours, about 60 hours, about 48 hours, about 36 hours, about 24 hours, about 12 hours, about 10 hours, about 8 hours, about 6 hours, about 4 hours, about 2 hours, about 1 hour, or about 30 minutes, about 15 minutes or about 10 minutes prior to the administration of the additional therapy. When administered “after” the additional anti-tumor therapy, the anti-PD-1 antibody may be administered about 10 minutes, about 15 minutes, about 30 minutes, about 1 hour, about 2 hours, about 4 hours, about 6 hours, about 8 hours, about 10 hours, about 12 hours, about 24 hours, about 36 hours, about 48 hours, about 60 hours, about 72 hours, or more than 72 hours after the administration of the additional anti-tumor therapy. Administration “concurrent” with the additional anti-tumor therapy means that the anti-PD-1 antibody is administered to the subject within less than 10 minutes (before, after, or at the same time) of administration of the additional anti-tumor therapy.

In certain embodiments, the methods of the present invention comprise administration of an additional therapeutic agent wherein the additional therapeutic agent is an anti-cancer drug. As used herein, “anti-cancer drug” means any agent useful to treat cancer including, but not limited to, cytotoxins and agents such as antimetabolites, alkylating agents, anthracyclines, antibiotics, antimitotic agents, procarbazine, hydroxyurea, asparaginase, corticosteroids, mytotane (O,P′-(DDD)), biologics (e.g., antibodies and interferons) and radioactive agents. As used herein, “a cytotoxin or cytotoxic agent”, also refers to a chemotherapeutic agent and means any agent that is detrimental to cells. Examples include, but are not limited to, Taxol® (paclitaxel), temozolamide, cytochalasin B, gramicidin D, ethidium bromide, emetine, cisplatin, mitomycin, etoposide, tenoposide, vincristine, vinbiastine, colchicine, doxorubicin, daunorubicin, dihydroxy anthracin dione, mitoxantrone, mithramycin, actinomycin D, 1-dehydrotestosterone, glucocorticoids, procaine, tetracaine, lidocaine, propranolol, and puromycin and analogs or homologs thereof.

In certain embodiments, the methods of the present invention comprise administration of an additional therapeutic agent or therapeutic regimen or procedure selected from the group consisting of surgery, radiation, a programmed death ligand 1 (PD-L1) inhibitor (e.g., an anti-PD-L1 antibody as disclosed in US Patent Publication 2015/0203580 or atezolizumab), a lymphocyte activation gene 3 (LAG-3) inhibitor (e.g., an anti-LAG-3 antibody), a cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) inhibitor (e.g., an anti-CTLA-4 antibody such as ipilimumab), a glucocorticoid-induced tumor necrosis factor receptor (GITR) inhibitor (e.g., an anti-GITR antibody), a T-cell immunoglobulin and mucin containing-3 (TIM3) inhibitor, a B- and T-lymphocyte attenuator (BTLA) inhibitor, a T cell immunoreceptor with Ig and ITIM domains (TIGIT) inhibitor, a CD47 inhibitor, an antagonist of another T-cell co-inhibitor or ligand (e.g., an antibody to CD-28, 2B4, LY108, LAIRI, ICOS, CD160 or VISTA), a CD20 inhibitor (e.g., an anti-CD20 antibody, or a bispecific CD3/CD20 antibody) an indoleamine-2,3-dioxygenase (IDO) inhibitor, a vascular endothelial growth factor (VEGF) antagonist [e.g., a “VEGF-Trap” such as aflibercept or other VEGF-inhibiting fusion protein as set forth in U.S. Pat. No. 7,087,411, or an anti-VEGF antibody or antigen binding fragment thereof (e.g., bevacizumab, or ranibizumab) or a small molecule kinase inhibitor of VEGF receptor (e.g., sunitinib, sorafenib, or pazopanib)], an angiopoietin 2 (Ang2) inhibitor (e.g., nesvacumab), a transforming growth factor beta (TGFβ) inhibitor, an epidermal growth factor receptor (EGFR) inhibitor (e.g., erlotinib, cetuximab), an agonist to a co-stimulatory receptor (e.g., an agonist to glucocorticoid-induced TNFR-related protein), an antibody to a tumor-specific antigen [e.g., CA9, CA125, melanoma-associated antigen 3 (MAGE3), carcinoembryonic antigen (CEA), vimentin, tumor-M2-PK, prostate-specific antigen (PSA), mucin-1, MART-1, and CA19-9], a vaccine (e.g., Bacillus Calmette-Guerin, a cancer vaccine), cyclophosphamide, an adjuvant to increase antigen presentation (e.g., granulocyte macrophage colony-stimulating factor), a cytotoxin, a chemotherapeutic agent (e.g., dacarbazine, temozolomide, docetaxel, doxorubicin, daunorubicin, cisplatin, carboplatin, gemcitabine, methotrexate, mitoxantrone, oxaliplatin, paclitaxel, and vincristine), an interleukin-6 receptor (IL-6R) inhibitor (e.g., sarilumab), an IL-4R inhibitor (e.g., dupilumab), an IL-10 inhibitor, a cytokine such as IL-2, IL-7, IL-21, and IL-15, an antibody-drug conjugate (ADC) (e.g., anti-CD19-DM4 ADC, and anti-DS6-DM4 ADC), chimeric antigen receptor T cells (e.g., CD19-targeted T cells), an anti-inflammatory drug (e.g., corticosteroids, and non-steroidal anti-inflammatory drugs), and a dietary supplement such as anti-oxidants.

In certain embodiments, the methods of the invention comprise administering an anti-PD-1 antibody in combination with radiation therapy and optionally, an anti-GITR antibody to generate long-term durable anti-tumor responses and/or enhance survival of patients with cancer. In some embodiments, the methods of the invention comprise administering radiation therapy prior to, concomitantly or after administering an anti-PD-1 antibody and an anti-GITR antibody to a cancer patient. For example, radiation therapy may be administered in one or more doses to tumor lesions after administration of one or more doses of the antibodies. In some embodiments, radiation therapy may be administered locally to a tumor lesion to enhance the local immunogenicity of a patient's tumor (adjuvinating radiation) and/or to kill tumor cells (ablative radiation) after systemic administration of an anti-PD-1 antibody and/or an anti-GITR antibody. In certain embodiments, the radiation therapy is administered to a first tumor lesion, but not to a second tumor lesion, wherein the administration in combination with the anti-PD-1 antibody leads to tumor regression in both the first and second tumor lesions (abscopal effect). In certain embodiments, the methods of the present invention comprise administering an anti-PD-1 antibody in combination with radiation therapy and optionally, an anti-GITR antibody to generate prolonged abscopal effect.

In certain embodiments, an anti-PD-1 antibody may be administered in combination with radiation therapy and a chemotherapeutic agent (e.g., temozolomide or cyclophosphamide), a VEGF antagonist (e.g., aflibercept), or granulocyte macrophage colony-stimulating factor.

Pharmaceutical Compositions and Administration

The present invention includes methods which comprise administering an anti-PD-1 antibody in combination with radiation to a subject wherein the anti-PD-1 antibody is contained within a pharmaceutical composition. The pharmaceutical compositions of the invention may be formulated with suitable carriers, excipients, and other agents that provide suitable transfer, delivery, tolerance, and the like. A multitude of appropriate formulations can be found in the formulary known to all pharmaceutical chemists: Remington's Pharmaceutical Sciences, Mack Publishing Company, Easton, Pa. These formulations include, for example, powders, pastes, ointments, jellies, waxes, oils, lipids, lipid (cationic or anionic) containing vesicles (such as LIPOFECTIN™), DNA conjugates, anhydrous absorption pastes, oil-in-water and water-in-oil emulsions, emulsions carbowax (polyethylene glycols of various molecular weights), semi-solid gels, and semi-solid mixtures containing carbowax. See also Powell et al. “Compendium of excipients for parenteral formulations” PDA (1998) J Pharm Sci Technol 52:238-311.

Various delivery systems are known and can be used to administer the pharmaceutical composition of the invention, e.g., encapsulation in liposomes, microparticles, microcapsules, recombinant cells capable of expressing the mutant viruses, receptor mediated endocytosis (see, e.g., Wu et al., 1987, J. Biol. Chem. 262: 4429-4432). Methods of administration include, but are not limited to, intradermal, intramuscular, intraperitoneal, intravenous, subcutaneous, intranasal, epidural, and oral routes. The composition may be administered by any convenient route, for example by infusion or bolus injection, by absorption through epithelial or mucocutaneous linings (e.g., oral mucosa, rectal and intestinal mucosa, etc.) and may be administered together with other biologically active agents.

A pharmaceutical composition of the present invention can be delivered subcutaneously or intravenously with a standard needle and syringe. In addition, with respect to subcutaneous delivery, a pen delivery device readily has applications in delivering a pharmaceutical composition of the present invention. Such a pen delivery device can be reusable or disposable. A reusable pen delivery device generally utilizes a replaceable cartridge that contains a pharmaceutical composition. Once all of the pharmaceutical composition within the cartridge has been administered and the cartridge is empty, the empty cartridge can readily be discarded and replaced with a new cartridge that contains the pharmaceutical composition. The pen delivery device can then be reused. In a disposable pen delivery device, there is no replaceable cartridge. Rather, the disposable pen delivery device comes prefilled with the pharmaceutical composition held in a reservoir within the device. Once the reservoir is emptied of the pharmaceutical composition, the entire device is discarded.

In certain situations, the pharmaceutical composition can be delivered in a controlled release system. In one embodiment, a pump may be used. In another embodiment, polymeric materials can be used; see, Medical Applications of Controlled Release, Langer and Wise (eds.), 1974, CRC Pres., Boca Raton, Fla. In yet another embodiment, a controlled release system can be placed in proximity of the composition's target, thus requiring only a fraction of the systemic dose (see, e.g., Goodson, 1984, in Medical Applications of Controlled Release, supra, vol. 2, pp. 115-138). Other controlled release systems are discussed in the review by Langer, 1990, Science 249:1527-1533.

The injectable preparations may include dosage forms for intravenous, subcutaneous, intracutaneous and intramuscular injections, drip infusions, etc. These injectable preparations may be prepared by known methods. For example, the injectable preparations may be prepared, e.g., by dissolving, suspending or emulsifying the antibody or its salt described above in a sterile aqueous medium or an oily medium conventionally used for injections. As the aqueous medium for injections, there are, for example, physiological saline, an isotonic solution containing glucose and other auxiliary agents, etc., which may be used in combination with an appropriate solubilizing agent such as an alcohol (e.g., ethanol), a polyalcohol (e.g., propylene glycol, polyethylene glycol), a nonionic surfactant [e.g., polysorbate 80, HCO-50 (polyoxyethylene (50 mol) adduct of hydrogenated castor oil)], etc. As the oily medium, there are employed, e.g., sesame oil, soybean oil, etc., which may be used in combination with a solubilizing agent such as benzyl benzoate, benzyl alcohol, etc. The injection thus prepared is preferably filled in an appropriate ampoule.

Advantageously, the pharmaceutical compositions for oral or parenteral use described above are prepared into dosage forms in a unit dose suited to fit a dose of the active ingredients. Such dosage forms in a unit dose include, for example, tablets, pills, capsules, injections (ampoules), suppositories, etc.

In certain embodiments, the present invention provides a pharmaceutical formulation comprising a therapeutic amount of an anti-PD-1 antibody and a pharmaceutical carrier. In certain embodiments, the present invention provides for an anti-PD-1 antibody formulated in a pharmaceutical composition for use in intravenous administration.

Administration Regimens

The present invention includes methods comprising administering to a subject an anti-PD-1 antibody at a dosing frequency of about four times a week, twice a week, once a week, once every two weeks, once every three weeks, once every four weeks, once every five weeks, once every six weeks, once every eight weeks, once every twelve weeks, or less frequently so long as a therapeutic response is achieved. In certain embodiments, the methods involve the administration of an anti-PD-1 antibody in combination with a second anti-tumor therapy (e.g., chemotherapy) at a dosing frequency of about twice a week, once a week, once every two weeks, once every three weeks, once every four weeks, once every five weeks, once every six weeks, once every eight weeks, once every nine weeks, once every twelve weeks, or less frequently so long as a therapeutic response is achieved.

In certain embodiments, the methods of the present invention comprise administering radiation therapy wherein the radiation therapy is hypofractionated radiation therapy. In certain embodiments, the hypofractionated radiation therapy comprises 2-12 fractions. In certain embodiments, the 2-12 fractions are administered on consecutive days. In certain embodiments, the radiation therapy is administered after administering one or more doses of an anti-PD-1 antibody. In certain embodiments, the anti-PD-1 antibody is administered 0.5-2 weeks before administration of one or more fractions of radiation therapy.

According to certain embodiments of the present invention, multiple doses of an anti-PD-1 antibody in combination with a second anti-tumor therapy (e.g., chemotherapy) may be administered to a subject over a defined time course. The methods according to this aspect of the invention comprise sequentially administering to a subject one or more doses of an anti-PD-1 antibody in combination with one or more doses of said second anti-tumor therapy. As used herein, “sequentially administering” means that each dose of the antibody is administered to the subject at a different point in time, e.g., on different days separated by a predetermined interval (e.g., hours, days, weeks or months). In certain embodiments, the methods of the present invention comprise sequentially administering one or more doses of an anti-PD-1 antibody wherein each dose is administered 0.5-12 weeks after the immediately preceding dose. In certain further embodiments, the methods further comprise administering a second anti-tumor therapy (e.g., chemotherapy). In certain embodiments, the chemotherapy may be platinum-based chemotherapy. In certain embodiments, the methods further comprise administering one or more doses of chemotherapy wherein each dose is administered 1 to 6 weeks after the immediately preceding dose.

In certain embodiments, the present invention includes methods which comprise sequentially administering to the patient a single initial dose of an anti-PD-1 antibody, followed by one or more secondary doses of the anti-PD-1 antibody, and optionally followed by one or more tertiary doses of the anti-PD-1 antibody. In certain embodiments, the methods further comprise sequentially administering to the patient a single initial dose of chemotherapy, followed by one or more secondary doses of chemotherapy, and optionally followed by one or more tertiary doses of the chemotherapy.

The terms “initial dose,” “secondary doses,” and “tertiary doses,” refer to the temporal sequence of administration. Thus, the “initial dose” is the dose which is administered at the beginning of the treatment regimen (also referred to as the “baseline dose”); the “secondary doses” are the doses which are administered after the initial dose; and the “tertiary doses” are the doses which are administered after the secondary doses. The initial, secondary, and tertiary doses may all contain the same amount of the antibody (anti-PD-1 antibody). In certain embodiments, however, the amount contained in the initial, secondary and/or tertiary doses varies from one another (e.g., adjusted up or down as appropriate) during the course of treatment. In certain embodiments, one or more (e.g., 1, 2, 3, 4, or 5) doses are administered at the beginning of the treatment regimen as “loading doses” followed by subsequent doses that are administered on a less frequent basis (e.g., “maintenance doses”). For example, an anti-PD-1 antibody may be administered to a patient with a cancer at a loading dose of about 1-3 mg/kg followed by one or more maintenance doses of about 0.1 to about 20 mg/kg of the patient's body weight.

In one exemplary embodiment of the present invention, each secondary and/or tertiary dose is administered ½ to 14 (e.g., ½, 1, 1½, 2, 2½, 3, 3½, 4, 4½, 5, 5½, 6, 6½, 7, 7½, 8, 8½, 9, 9½, 10, 10½, 11, 11½, 12, 12½, 13, 13½, 14, 14½, or more) weeks after the immediately preceding dose. The phrase “the immediately preceding dose,” as used herein, means, in a sequence of multiple administrations, the dose of anti-PD-1 antibody (and optionally, a second anti-tumor therapy) which is administered to a patient prior to the administration of the very next dose in the sequence with no intervening doses.

The methods according to this aspect of the invention may comprise administering to a patient any number of secondary and/or tertiary doses of an anti-PD-1 antibody (and/or a second anti-tumor therapy). For example, in certain embodiments, only a single secondary dose is administered to the patient. In other embodiments, two or more (e.g., 2, 3, 4, 5, 6, 7, 8, or more) secondary doses are administered to the patient. Likewise, in certain embodiments, only a single tertiary dose is administered to the patient. In other embodiments, two or more (e.g., 2, 3, 4, 5, 6, 7, 8, or more) tertiary doses are administered to the patient.

In embodiments involving multiple secondary doses, each secondary dose may be administered at the same frequency as the other secondary doses. For example, each secondary dose may be administered to the patient 1 to 2 weeks after the immediately preceding dose. Similarly, in embodiments involving multiple tertiary doses, each tertiary dose may be administered at the same frequency as the other tertiary doses. For example, each tertiary dose may be administered to the patient 2 to 4 weeks after the immediately preceding dose. Alternatively, the frequency at which the secondary and/or tertiary doses are administered to a patient can vary over the course of the treatment regimen. The frequency of administration may also be adjusted during the course of treatment by a physician depending on the needs of the individual patient following clinical examination.

In certain embodiments, one or more doses of an anti-PD-1 antibody and/or a second anti-tumor therapy are administered at the beginning of a treatment regimen as “induction doses” on a more frequent basis (twice a week, once a week or once in 2 weeks) followed by subsequent doses (“consolidation doses” or “maintenance doses”) that are administered on a less frequent basis (e.g., once in 2-12 weeks). In certain embodiments, one or more doses of an anti-PD-1 antibody and/or radiation are administered at the beginning of a treatment regimen as “induction doses” on a more frequent basis (twice a week, once a week or once in 2 weeks) followed by subsequent doses of the anti-PD-1 antibody.

The present invention includes methods which comprise sequentially administering one or more doses of an anti-PD-1 antibody in combination with one or more doses of an additional anti-tumor therapy wherein the one or more doses are comprised in one or more treatment cycles.

According to certain embodiments of the present invention, the methods comprise administering at least one treatment cycle wherein the at least one treatment cycle comprises administration of one or more doses of an anti-PD-1 antibody, and optionally one or more doses of a second anti-tumor therapy (e.g., chemotherapy, radiation). In certain embodiments, a treatment cycle comprises 1-10 doses of the anti-PD-1 antibody wherein each dose of the anti-PD-1 antibody is administered 0.5-8 weeks after the immediately preceding dose. In certain embodiments, the methods of the present invention comprise administration of up to 6 or 8 treatment cycles. In certain other embodiments, the methods of the present invention comprise administration of up to 100 treatment cycles, or more as required for therapeutic effect. In certain embodiments, at least one treatment cycle further comprises a second anti-tumor therapy (e.g., chemotherapy). In some embodiments, the chemotherapy is platinum-based chemotherapy. In certain embodiments, doses of chemotherapy are administered once every week, every 2 weeks, every 3 weeks, every 4 weeks or more.

The present invention includes methods comprising sequential administration of an anti-PD-1 antibody in combination with chemotherapy, to a patient to treat a cancer (e.g., lung cancer) resulting in increased anti-tumor efficacy (e.g., greater inhibition of tumor growth, increased prevention of tumor recurrence as compared to an untreated subject or a subject administered with either antibody or chemotherapy as monotherapy). In some embodiments, the chemotherapy is administered before, after or concurrently with the anti-PD-1 antibody.

Dosage

The amount of anti-PD-1 antibody administered to a subject according to the methods of the present invention is, generally, a therapeutically effective amount. As used herein, the phrase “therapeutically effective amount” means an amount of antibody (anti-PD-1 antibody that results in one or more of. (a) a reduction in the severity or duration of a symptom or an indication of a cancer, e.g., a solid tumor; (b) inhibition of tumor growth, or an increase in tumor necrosis, tumor shrinkage and/or tumor disappearance; (c) delay in tumor growth and development; (d) inhibition of tumor metastasis; (e) prevention of recurrence of tumor growth; (f) increase in survival of a subject with a cancer; and/or (g) a reduction in the use or need for conventional anti-cancer therapy (e.g., reduced or eliminated use of chemotherapeutic or cytotoxic agents) as compared to an untreated subject or a subject administered with the antibody as monotherapy.

In the case of an anti-PD-1 antibody, a therapeutically effective amount can be from about 0.05 mg to about 1500 mg, from about 1 mg to about 1500 mg, from about 10 mg to about 1400 mg, from about 50 mg to about 1400 mg, from about 75 mg to about 1400 mg, or from about 100 mg to about 1300 mg of the antibody. For example, in various embodiments, the amount of the anti-PD-1 antibody is about 0.05 mg, about 0.1 mg, about 1.0 mg, about 2.0 mg, about 10 mg, about 20 mg, about 30 mg, about 40 mg, about 50 mg, about 60 mg, about 70 mg, about 80 mg, about 90 mg, about 100 mg, about 150 mg, about 200 mg, about 220 mg, about 240 mg, about 260 mg, about 280 mg, about 300 mg, about 350 mg, about 400 mg, about 450 mg, about 500 mg, about 550 mg, about 600 mg, about 650 mg, about 700 mg, about 750 mg, about 800 mg, about 850 mg, about 900 mg, about 950 mg, about 1000 mg, about 1050 mg, about 1100 mg, about 1150 mg, about 1200 mg, about 1250 mg, about 1300 mg, about 1400 mg, or about 1500 mg, of the anti-PD-1 antibody. In one embodiment, 250 mg of an anti-PD-1 antibody is administered according to the methods of the present invention. In one embodiment, 200 mg of an anti-PD-1 antibody is administered according to the methods of the present invention. In one embodiment, 350 mg of an anti-PD-1 antibody is administered according to the methods of the present invention. In one embodiment, 1050 mg of an anti-PD-1 antibody is administered according to the methods of the present invention

The amount of either anti-PD-1 antibody contained within the individual doses may be expressed in terms of milligrams of antibody per kilogram of subject body weight (i.e., mg/kg). In certain embodiments, the anti-PD-1 antibody used in the methods of the present invention may be administered to a subject at a dose of about 0.0001 to about 100 mg/kg of subject body weight. In certain embodiments, an anti-PD-1 antibody may be administered at dose of about 0.1 mg/kg to about 20 mg/kg of a patient's body weight. In certain embodiments, the methods of the present invention comprise administration of an anti-PD-1 antibody at a dose of about 1 mg/kg, 3 mg/kg, 5 mg/kg or 10 mg/kg of a patient's body weight.

In certain embodiments, the amount of anti-PD-1 antibody administered to a patient may be less than a therapeutically effective amount, i.e., a subtherapeutic dose. For example, if the therapeutically effective amount of an anti-PD-1 antibody comprises 3 mg/kg, a subtherapeutic dose comprises an amount less than 3 mg/kg, e.g., 2 mg/kg, 1.5 mg/kg, 1 mg/kg, 0.5 mg/kg or 0.3 mg/kg. As defined herein, a “subtherapeutic dose” refers to an amount of the anti-PD-1 antibody that does not lead to a therapeutic effect by itself. However, in certain embodiments, a subtherapeutic dose of an anti-PD-1 antibody is administered with a second and optionally a third therapeutic agent to promote a therapeutic effect.

EXAMPLES

The following examples are put forth so as to provide those of ordinary skill in the art with a complete disclosure and description of how to make and use the methods and compositions of the invention, and are not intended to limit the scope of what the inventors regard as their invention. Efforts have been made to ensure accuracy with respect to numbers used (e.g., amounts, temperature, etc.) but some experimental errors and deviations should be accounted for. Unless indicated otherwise, parts are parts by weight, molecular weight is average molecular weight, temperature is in degrees Centigrade, and pressure is at or near atmospheric.

Example 1: In Vivo Efficacy of Anti-PD-1 Antibody in Combination with Radiation Therapy Against MC38 Tumors

In this Example, the effect of PD-1 blockade in combination with radiation therapy was examined against established MC38 tumors in mice.

5×10⁵ MC38 colon carcinoma cells were implanted subcutaneously into the right flanks of female C57BL/6 mice (Jackson Laboratory). Treatment was initiated on day 9 post implantation when average tumor volumes reached approximately 100 mm³. The mice were randomly assigned to receive either isotype control (2A3, BioXcell) or PD-1 blocking antibody (RMP1-14, BioXCell) at 5 mg/kg, 2× a week, for a total of 5 intraperitoneal injections. One day post the start of antibody treatment, mice assigned to the radiotherapy groups received 12 Gy of irradiation to their right flank tumors. Radiotherapy was delivered using the RS 2000 Biological Research Irradiator (Rad Source) to anesthesized mice (ketamine/xylazine) shielded with partial body irradiation fixtures (Precision X-ray) and lead sheeting (Images Scientific Instruments). Tumor growth was evaluated 3× a week until days 70-80 when all mice were euthanized. FIG. 1 shows study design of the experiment which includes dosing of the anti-PD-1 antibody and radiation.

FIG. 2 and Table 1 show the average tumor volumes in mice administered with the anti-PD-1 antibody alone or in combination with radiation.

TABLE 1 Average tumor volumes in mice administered with anti- PD-1 antibody alone or in combination with radiation Average tumor volume (mm³ ± SEM) Isotype Anti-PD-1 Days post- Isotype Anti-PD-1 control + antibody + implantation control antibody radiation radiation 4 15.39 ± 3.70  8.62 ± 3.02 13.28 ± 3.44  10.78 ± 3.01 7 41.11 ± 8.81 38.90 ± 7.09 49.86 ± 11.38 39.36 ± 6.32 8  68.64 ± 10.01  72.03 ± 12.13 74.03 ± 14.83  73.70 ± 14.86 10 85.82 ± 4.10  94.98 ± 22.68 100.88 ± 11.46  122.05 ± 15.05 14 725.87 ± 68.45  834.37 ± 206.70 320.10 ± 58.80  300.67 ± 60.74 16 1023.61 ± 191.41 1123.51 ± 310.04 276.17 ± 82.81  219.29 ± 45.94 18 1573.64 ± 263.65 1710.30 ± 424.30 353.45 ± 121.47 250.17 ± 74.70 21 2688.69 ± 502.39 2569.65 ± 633.35 494.53 ± 211.90  188.98 ± 105.80 23 597.70 ± 267.02 141.37 ± 73.76 25 671.93 ± 347.76 134.87 ± 75.67 28 879.64 ± 403.70 147.82 ± 70.88 30 1081.39 ± 426.80  133.13 ± 88.88 32  177.73 ± 112.81 36  233.44 ± 152.91 39  258.23 ± 158.67 42  316.58 ± 160.91 44  332.73 ± 152.43 46  456.13 ± 209.45 49  564.05 ± 262.32 51  925.92 ± 434.29 53  747.14 ± 350.90 56 1290.10 ± 584.62

PD-1 (RMP1-14) blockade synergized with local irradiation (XRT) and significantly induced tumor regression (4/6 mice) in MC38-tumor bearing mice, in comparison to XRT+isotype control treated mice (2/6 mice). Tumor growth was inhibited or delayed in mice treated with anti-PD-1 antibody in combination with radiation. Mice treated with anti-PD-1 antibody and radiation took more than 40 days to reach 500 mm³ tumor volume as compared to mice on monotherapy which took less than 20 days to reach 500 mm³ tumor volume. Tumor regression was sustained for up to 4 weeks for the combo (XRT+anti-PD-1 antibody) treated group (1 out of the 4 rejected tumors relapsed at this time point) versus 1.5 weeks for the XRT+isotype treated group (1 out of the 2 rejected tumors relapsed). In this tumor model, PD-1 blockade as a monotherapy did not have an effect on primary tumor growth.

TABLE 2 Percent survival of mice administered with anti-PD-1 antibody alone or in combination with radiation days post Radiation + Radiation + implantation isotype Anti-PD-1 isotype anti-PD-1 4 100 100 100 100 7 100 100 100 100 8 100 100 100 100 10 100 100 100 100 14 100 100 100 100 16 100 100 100 100 18 100 100 100 100 21 100 100 100 100 23 100 83 100 100 25 67 50 100 100 28 33 50 100 100 30 17 17 100 100 32 0 17 67 100 36 0 0 67 100 44 0 0 50 100 46 0 0 50 100 49 0 0 50 100 51 0 0 33 100 53 0 0 17 100 56 0 0 17 100 58 0 0 17 83 60 0 0 17 50 63 0 0 17 50 65 0 0 17 50 81 0 0 17 50 85 0 0 17 50

The therapeutic efficacy of the combinatorial treatment (XRT+anti-PD-1 antibody) was demonstrated by the statistically increased overall survival of this group (50% alive at 70 days post tumor implantation) in comparison to all other treatment groups: isotype control (0% alive at d70), anti-PD-1 antibody treatment (0% alive at d70), and XRT+isotype treated mice (17% alive at d70) (FIG. 3; Table 2).

Example 2: In Vivo Efficacy of Anti-PD-1 Antibody and Radiation Therapy Against B16 Tumors

In this Example, the anti-tumor effect of anti-mouse PD-1 antibody in combination with radiation therapy was examined against established B16 tumors in mice.

2×10⁵ B16F10.9 melanoma cells were implanted subcutaneously into the right flanks of female C57BL/6 mice (Jackson Laboratory). Treatment was initiated when average tumor volumes reached approximately 150 mm³. The mice were randomly assigned to receive either isotype control (2A3, BioXcell) or PD-1 blocking antibody (RMP1-14, BioXCell) at 5 mg/kg, 2× a week, for a total of 5 intraperitoneal injections. One day post the start of antibody treatment, mice assigned to the radiotherapy groups received 8 Gy of irradiation to their right flank tumors. Radiotherapy was delivered using the RS 2000 Biological Research Irradiator (Rad Source) to anesthesized mice (ketamine/xylazine) shielded with partial body irradiation fixtures (Precision X-ray) and lead sheeting (Images Scientific Instruments). Tumor growth was evaluated 3× a week until days 70-80 when all mice were euthanized. FIG. 4 shows study design of the experiment which includes dosing of the anti-PD-1 antibody and radiation.

PD-1 (RMP1-14) blocking antibody treatment in combination with local irradiation (XRT) delayed Bt6 primary tumor growth in comparison to XRT or anti-PD-1 antibody monotherapy (FIG. 5; Table 3).

TABLE 3 Average tumor volumes in mice administered with anti- PD-1 antibody alone or in combination with radiation Average tumor volume mm³ ± SEM Isotype Anti-PD-1 Days post- Isotype Anti-PD-1 control + antibody + implantation control antibody radiation radiation 6  5.75 ± 5.75  8.32 ± 8.32 13.79 ± 13.79 1.14 ± 0.85 8  55.98 ± 27.15  62.66 ± 15.80 57.18 ± 37.79 50.57 ± 38.33 12 157.34 ± 37.88 144.36 ± 37.81 237.84 ± 71.27  177.91 ± 59.17  15 334.71 ± 61.71 193.32 ± 35.53 510.95 ± 171.15 372.53 ± 147.50 18  621.43 ± 136.09 363.80 ± 45.72 739.62 ± 244.10 440.33 ± 194.90 20  939.69 ± 158.50 561.64 ± 49.44 677.48 ± 175.75 486.35 ± 207.65 22 1329.77 ± 202.01  772.16 ± 118.26 759.15 ± 235.94 512.67 ± 220.30 25 2602.08 ± 434.08 1343.42 ± 120.65 1182.27 ± 336.32  789.80 ± 299.24 27 1533.03 ± 179.88 1321.13 ± 400.18  877.82 ± 296.51 29 2104.46 ± 350.48 944.67 ± 333.16 33 1024.71 ± 321.20  36 1237.68 ± 340.52 

TABLE 4 Percent survival of mice administered with anti-PD-1 antibody alone or in combination with radiation days post Radiation + Radiation + implantation isotype Anti-PD-1 isotype anti-PD-1 0 100 100 100 100 6 100 100 100 100 8 100 100 100 100 12 100 100 100 100 15 100 100 100 100 18 100 100 100 100 20 100 100 100 100 22 100 100 100 100 25 100 100 100 100 27 40 100 100 100 29 0 100 80 100 33 0 80 80 100 36 0 20 60 100 39 0 0 60 83 41 0 0 60 83 43 0 0 20 67 46 0 0 20 67 48 0 0 20 50 50 0 0 0 50 53 0 0 0 33 55 0 0 0 33 57 0 0 0 33 60 0 0 0 17 62 0 0 0 17 64 0 0 0 17 66 0 0 0 0

Combination of XRT plus anti-PD-1 antibody treatment increased overall survival (50% alive at d50 post implantation) in comparison to XRT alone (0% alive by d50), anti-PD-1 antibody alone (0% alive by d40), and isotype alone (0% alive by d30) (FIG. 6; Table 4).

Example 3: In Vivo Efficacy of Anti-PD-1 Antibody in Combination with Radiation Therapy Against Metastatic Lung Tumors

In this Example, the effect of PD-1 blockade in combination with radiation therapy was examined against established and metastatic tumors in mice.

1.5×10⁵ 4T1 mammary carcinoma cells were implanted subcutaneously into the right flanks of female Balb/c mice (Jackson Laboratory). Treatment was initiated on day 12 post implantation when average tumor volumes reached approximately 100 mm³. The mice were randomly assigned to receive either isotype control (2A3, BioXcell) or PD-1 blocking antibody (RMP1-14, BioXCell) at 5 mg/kg, 2× a week, for a total of 5 intraperitoneal injections. One day post the start of antibody treatment, mice assigned to the radiotherapy groups received 8 Gy of irradiation to their right flank tumors. Radiotherapy was delivered using the RS 2000 Biological Research Irradiator (Rad Source) to anesthesized mice (ketamine/xylazine) shielded with partial body irradiation fixtures (Precision X-ray) and lead sheeting (Images Scientific Instruments). Tumor growth was evaluated 3× a week until day 28 when all mice were euthanized in order to evaluate lung metastatic burden using a clonogenic assay. Briefly, lung tissue was dissociated with DNAse/Liberase TL (Roche) and cultured in media supplemented with 60 uM 6-thioguanine. After two weeks in culture, the plates were counterstained with methylene blue and the number of colonies enumerated (one colony represents one metastatic 4T1 cell).

It is expected that treatment with anti-PD-1 antibody in combination with radiation promotes tumor regression as well as mediates suppression of metastatic growth.

Example 4: In Vivo Efficacy of Anti-Human PD-1 Antibody in Combination with Radiation Therapy Promotes Abscopal Effect Against Distal Tumors

In this Example, the effect of PD-1 blockade in combination with radiation therapy was examined against primary and distal MC38 tumors in mice humanized for PD-1 using anti-human PD-1 antibodies.

The exemplary anti-PD-1 antibody used in this Example is REGN2810 (also known as H4H7798N as disclosed in US20150203579), a fully human monoclonal anti-PD-1 antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 9 and a light chain comprising the amino acid sequence of SEQ ID NO: 10; an HCVR/LCVR amino acid sequence pair comprising SEQ ID NOs: 1/2; and heavy and light chain CDR sequences comprising SEQ ID NOs: 3-8.

Mice humanized for PD-1 were engineered using VelociGene® technology (Valenzuela et al 2003, Nat. Biotechnol. 21: 652-659; US Patent Application Publication 2015/0366174).

5×10⁵ MC38 colon carcinoma cells were implanted subcutaneously into female humanized PD-1/C57BL/6 mice on day 0 (primary tumor on right flank) and day 3 (tumor on left flank; distal tumor). Treatment was initiated when the average primary tumor volumes reached approximately 150 mm³. The mice were randomly assigned to receive either isotype control or PD-1 blocking antibody (REGN2810) at 5 mg/kg, 2× a week, for a total of 8 intra-peritoneal injections. One day post the start of antibody treatment, mice assigned to the radiotherapy groups received 8 Gy of irradiation to their right flank tumors. Radiotherapy was delivered using the RS 2000 Biological Research Irradiator (Rad Source) to anesthetized mice (ketamine/xylazine) shielded with partial body irradiation fixtures (Precision X-ray) and lead sheeting (Images Scientific Instruments). Primary and secondary tumor growth was evaluated 3× a week until days 70-80 when all mice were euthanized. FIG. 7 shows the study design of the experiment which includes dosing of the anti-PD-1 antibody and radiation.

Results

Primary Tumor: PD-1 blockade (REGN2810) treatment synergized with local irradiation (XRT) in rejecting primary MC38 tumors (4 out of 6 tumor free mice) in comparison to XRT+isotype control treated mice (1/6 tumor free mice). Tumor regression was sustained in the combo treated group for 8 weeks until end of experiment versus three weeks for the XRT+isotype treated group (the rejected tumor relapsed at this time point) (FIG. 8; Table 5).

TABLE 5 Average primary tumor volumes in mice administered with REGN2810 alone or in combination with radiation Average tumor volume (mm³ ± SEM) Isotype Days post- Isotype control + REGN2810 + implantation control REGN2810 radiation radiation 4  8.47 ± 5.22 13.86 ± 7.13  9.02 ± 3.07 3.75 ± 3.75 5 14.32 ± 4.76 22.08 ± 2.69 27.54 ± 4.90 10.00 ± 3.17  7 39.43 ± 5.36 35.47 ± 6.73 42.72 ± 8.00 32.80 ± 10.60 9  62.68 ± 12.03  84.73 ± 20.91  68.27 ± 11.65 47.26 ± 11.65 10 111.78 ± 24.45 108.15 ± 27.17  96.18 ± 18.07 75.13 ± 11.56 11 147.89 ± 36.11 176.67 ± 43.99 111.87 ± 10.12 110.27 ± 25.02  12 171.76 ± 41.23 154.97 ± 44.16 153.69 ± 16.06 121.88 ± 29.86  14 304.95 ± 94.96 221.70 ± 65.96 147.22 ± 19.77 144.71 ± 34.28  17  609.24 ± 227.64 296.69 ± 95.14 116.65 ± 27.03 135.26 ± 57.41  19  369.17 ± 128.37 114.85 ± 38.73 124.59 ± 55.50  21  442.13 ± 158.80 127.77 ± 36.92 130.00 ± 78.30  24  641.92 ± 275.23 198.40 ± 67.81 113.25 ± 74.51  26  896.32 ± 389.54 252.51 ± 98.39 116.90 ± 101.35 28 1200.99 ± 498.27  331.78 ± 125.55 120.05 ± 89.32  31  477.34 ± 181.97 168.62 ± 151.18 33 189.07 ± 154.91 35 164.70 ± 127.33 38 216.32 ± 159.47 40 219.35 ± 156.39 42 292.37 ± 204.83

PD-1 blockade as a monotherapy mediated rejection in 2 out of mice; however, 1 of the mice which rejected its primary tumor, succumbed to secondary tumor growth, resulting in only 1 mouse surviving to the end of the experiment. The potent therapeutic efficacy of combinatorial treatment (XRT+REGN2810) was demonstrated by statistically increased overall survival (˜67% alive at 70 days post tumor implantation) in comparison to all other groups: isotype control or XRT alone (0% alive at d70), and REGN2810 as a monotherapy (20% alive at d70) (FIG. 9; Table 6).

TABLE 6 Percent survival of mice administered with REGN2810 alone or in combination with radiation days post Radiation + Radiation + implantation isotype REGN2810 isotype REGN2810 0 100 100 100 100 4 100 100 100 100 5 100 100 100 100 7 100 100 100 100 9 100 100 100 100 10 100 100 100 100 11 100 100 100 100 12 100 100 100 100 14 100 100 100 100 17 100 100 100 100 19 83 100 100 100 21 83 100 100 100 24 83 100 100 100 26 50 100 100 100 28 33 100 100 100 31 33 67 100 100 33 33 33 83 100 35 33 33 67 100 38 33 33 50 100 40 17 17 50 100 42 17 17 50 100 44 17 17 50 100 49 0 17 17 83 54 17 0 83 56 17 0 83 59 17 0 83 61 17 0 67 63 17 0 67

Distal tumor: REGN2810 in combination with XRT significantly promoted an abscopal effect (rejection of a tumor implanted at a distal site) with 5 out of 6 tumor free mice in comparison to XRT alone (2/6 distal tumor free), REGN2810 alone (1/6 distal tumor free), and isotype control treated mice (1/6 distal tumor free) (FIG. 10; Table 7).

TABLE 7 Average distal tumor volumes in mice administered with REGN2810 alone or in combination with radiation Average tumor volume (mm³ ± SEM) Isotype Days post- Isotype control + REGN2810 + implantation control REGN2810 radiation radiation 1 0 0 0 0 2 0 0 0 0 4 0 0 0 0 6 0 0 0 0 7 11.13 ± 11.13 0 0 0 8 20.01 ± 20.01 0 3.26 ± 3.26 0 9 25.43 ± 25.43 7.00 ± 7.00 9.75 ± 9.75 0 11 31.93 ± 29.32 42.24 ± 26.88 28.81 ± 17.01 12.13 ± 12.13 14 56.20 ± 34.46 59.40 ± 29.41 57.64 ± 29.91 20.93 ± 14.07 16 58.64 ± 29.57 95.78 ± 52.87 14.03 ± 9.79  18 151.71 ± 76.86  115.16 ± 59.43  22.87 ± 16.20 21 207.13 ± 128.83 227.22 ± 105.46 17.01 ± 17.01 23 333.43 ± 220.57 335.13 ± 148.86 9.51 ± 9.51 25 506.55 ± 355.36 503.71 ± 211.49 11.45 ± 11.45 28 968.92 ± 418.57 31.59 ± 31.59 30 57.40 ± 57.40 32 83.94 ± 83.94 35 133.89 ± 133.89 37 224.65 ± 224.65

Example 5: In Vivo Efficacy of Anti-PD-1 Antibody in Combination with Radiation Therapy and a GITR Antagonist Against MC38 Tumors

In this Example, the effect of PD-1 blockade in combination with radiation therapy and a glucocorticoid-induced tumor necrosis factor receptor (GITR) antagonist (an anti-GITR antibody) was examined against large established MC38 tumors in mice.

5×10⁵ MC38 colon carcinoma cells were implanted subcutaneously into the right flanks of female C57BL/6 mice (Jackson Laboratory). Treatment was initiated when average tumor volumes reached approximately 150-200 mm³ (categorized as “large tumors”). The mice were randomly assigned to receive either isotype control antibody (2A3 or LTF-2; BioXcell), an anti-PD-1 antibody (RMP1-14; BioXcell), an anti-GITR antibody (DTA-1; BioXcell), or the combination of both anti-PD-1 antibody and anti-GITR antibody at 5 mg/kg, 2× a week, for a total of 5 intraperitoneal injections. One day post the start of antibody treatment, mice assigned to the radiotherapy groups received 8 Gy of irradiation to their right flank tumors. Radiotherapy was delivered using the RS 2000 Biological Research Irradiator (Rad Source) to anesthesized mice (ketamine/xylazine) shielded with partial body irradiation fixtures (Precision X-ray) and lead sheeting (Images Scientific Instruments). Tumor growth was evaluated 3× a week until days 70-80 when all mice were euthanized. FIG. 11 shows study design of the experiment which includes dosing of the anti-PD-1 antibody, anti-GITR antibody, and radiation.

The anti-PD-1 antibody (RMP1-14) treatment synergized with local irradiation (XRT) and the anti-GITR antibody in rejecting large MC38 tumors (4 out of 6 tumor free mice) in comparison to XRT+anti-GITR antibody (2/6 tumor free), XRT+anti-PD-1 antibody (2/6 rejected), or XRT alone (0/6 tumor free) treated mice. Monotherapy (with anti-PD-1 antibody or anti-GITR antibody) or combinatorial treatment (anti-PD-1 antibody+anti-GITR antibody) had minimal effect on tumor growth with anti-PD-1 antibody or anti-GITR antibody treatment mediating rejection in 1/5 mice and the combination of the two antibodies mediating rejection in 2/5 mice. Tumor regression was sustained for up to 6.5 weeks after the start of treatment for the triple combo treated mice versus 2 weeks for the XRT+anti-GITR antibody treated mice (FIG. 12).

TABLE 8 Percent survival of mice administered anti-PD-1 antibody in combination with radiation and anti-GITR antibody Radiation + Days post Anti- Anti- Anti-PD-1 + Radiation + Radiation + Radiation + anti-PD-1 + implantation Isotype PD-1 GITR anti-GITR isotype anti-PD-1 anti-GITR anti-GITR 0 100 100 100 100 100 100 100 100 28 100 100 80 100 100 100 100 100 32 80 80 80 80 100 100 100 100 35 60 60 40 60 100 80 83 100 38 20 20 20 60 40 80 50 100 41 0 20 20 60 20 60 50 100 48 0 20 20 60 0 60 50 83 56 0 20 20 40 0 40 33 67 66 0 20 20 40 0 40 17 67 77 0 20 20 40 0 40 17 67

Table 8 and FIG. 13 show the survival of mice administered with anti-PD-1 antibody in combination with radiation therapy and anti-GITR antibody. Further, administration of anti-PD-1 antibody+XRT led to tumor regression of very large tumors (˜300 mm³).

Example 6: In Vivo Efficacy of Anti-PD-1 Antibody in Combination with Radiation Therapy and a GITR Antagonist Against B16 Tumors

In this Example, the effect of PD-1 blockade in combination with radiation therapy and a GITR antagonist (anti-GITR antibody) was examined against established B16 tumors in mice.

2.5×10⁵ B16F10.9 melanoma cells were implanted subcutaneously into the right flanks of female C57BL/6 mice (Jackson Laboratory). Treatment was initiated when average tumor volumes reached approximately 100 mm³. The mice were randomly assigned to receive either isotype controls (2A3, LTF-2; BioXcell), anti-PD-1 antibody (RMP1-14, BioXcell), anti-GITR antibody (DTA-1; BioXcell), or the combination of both the anti-PD-1 antibody and anti-GITR antibody at 5 mg/kg, 2× a week, for a total of 5 intraperitoneal injections. One day post the start of antibody treatment, mice assigned to the radiotherapy groups received 8 Gy of irradiation to their right flank tumors. Radiotherapy was delivered using the RS 2000 Biological Research Irradiator (Rad Source) to anesthesized mice (ketamine/xylazine) shielded with partial body irradiation fixtures (Precision X-ray) and lead sheeting (Images Scientific Instruments). Tumor growth was evaluated 3× a week until days 70-80 when all mice were euthanized.

It is expected that anti-PD-1 antibody in combination with the anti-GITR antibody and radiation therapy promotes more tumor regression and delay in tumor growth than monotherapy or ant-PD-1 antibody in combination with radiation therapy.

Example 7: Clinical Trial of Anti-PD-1 Antibody and Radiation Therapy in Patients with Advanced Solid Tumors

This study is an open-label, multicenter, dose escalation study with multiple dose escalation and expansion arms to investigate the efficacy, safety, and tolerability of anti-PD-1 antibody alone and in combination with other anti-cancer therapies (including radiation therapy), in adult patients with advanced solid tumors.

The exemplary anti-PD-1 antibody used in this study is REGN2810 (also known as H4H7798N as disclosed in US20150203579), a fully human monoclonal anti-PD-1 antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 9 and a light chain comprising the amino acid sequence of SEQ ID NO: 10; an HCVR/LCVR amino acid sequence pair comprising SEQ ID NOs: 1/2; and heavy and light chain CDR sequences comprising SEQ ID NOs: 3-8.

Study Objectives

The primary objective of the study is to characterize the safety, tolerability, dose limiting toxicities (DLTs) of REGN2810 administered intravenously (IV) as monotherapy, or in combination with targeted radiation (with the intent to have this serve as an immuno-stimulatory, rather than primarily tumor-ablative therapy), low-dose cyclophosphamide (a therapy shown to inhibit regulatory T-cell responses), granulocyte macrophage colony-stimulating factor, carboplatin, docetaxel, or a combination thereof in patients with advanced malignancies.

The secondary objectives of the study are: (1) to determine a recommended phase 2 dose (RP2D) of REGN2810 as monotherapy and in combination with other anti-cancer therapies (targeted radiation, low-dose cyclophosphamide, or both); (2) to describe preliminary antitumor activity of REGN2810, alone and with each combination partner (s); (3) to characterize the PK of REGN2810 as monotherapy and in combination with other anti-cancer therapies (targeted radiation, low-dose cyclophosphamide, or both); and (4) to assess immunogenicity of REGN2810.

Rationale for Study Design

The 3+3 model for the dose-escalation phase of this study is designed to permit evaluation of the safety of REGN2810, both as monotherapy at different dose levels, and in combination with immune-enhancing treatments: cyclophosphamide; limited, targeted radiation delivered in 1 of 2 dosing regimens; or combined radiation and cyclophosphamide.

Once the tolerability of REGN2810 has been established alone and in combination with radiation and/or cyclophosphamide, multiple expansion cohorts using various combinations or monotherapy in select indications [NSCLC, BC, HNSCC, CSCC, tumors with MSI (colorectal, endometrial, prostate, or other tumor types), HCC, and other advanced solid tumors] are added in order to further confirm the safety and evaluate the augmentation of antitumor activity. Granulocyte-macrophage colony-stimulating factor (GM-CSF), carboplatin, and/or docetaxel are added to some of these combinations.

Table 9 lists some of the cohorts using REGN2810 monotherapy and in combination with other treatment modalities.

TABLE 9 A list of some of the expansion cohorts for REGN2810 monotherapy and combination therapies Cohort Indication Treatment 1 Non-small-cell lung cancer Flat dose - 200 mg REGN2810 (NSCLC) 2 NSCLC 3 mg/kg REGN2810 + radiotherapy (9 Gy × 3) 3 Head and neck squamous cell 3 mg/kg REGN2810 + carcinoma (HNSCC) radiotherapy (9 Gy × 3) + cyclophosphamide + GM-CSF 4 Breast cancer (BC) 3 mg/kg REGN2810 + radiotherapy (9 Gy × 3) + cyclophosphamide 5 Advanced solid tumors -Previous 3 mg/kg REGN2810 + radiotherapy treatment with an anti PD-1/PD-L1 (9 Gy × 3) + cyclophosphamide + antibody GM-CSF 6 Advanced solid tumors (excluding 3 mg/kg REGN2810 + radiotherapy NSCLC, HNSCC, and BC) (9 Gy × 3) + cyclophosphamide + GM-CSF 7 Metastatic (M1) cutaneous 3 mg/kg REGN2810 squamous cell carcinoma (CSCC) 8 Locally and/or regionally advanced 3 mg/kg REGN2810 CSCC (M0) that is unresectable 9 Metastatic colorectal cancer with 3 mg/kg REGN2810 microsatellite instability (MSI) 10 Metastatic endometrial cancer with 3 mg/kg REGN2810 MSI 11 Castrate recurrent prostate cancer 3 mg/kg REGN2810 with MSI 12 Any other advanced solid tumor 3 mg/kg REGN2810 with MSI 13 Advanced or metastatic 3 mg/kg REGN2810 hepatocellular cancer (HCC) 14 Advanced solid tumor refractory to 3 mg/kg REGN2810 + carboplatin + first line chemotherapy docetaxel (low dose) 15 Advanced solid tumor refractory to 3 mg/kg REGN2810 + docetaxel first line chemotherapy (low dose) 16 Metastatic colorectal cancer with 3 mg/kg REGN2810 MSI, previously untreated 17 Advanced NSCLC previously 3 mg/kg REGN2810 + carboplatin + untreated docetaxel (low dose) 18 Newly diagnosed glioblastoma REGN2810 (1 or 3 mg/kg) + multiforme (GBM) radiotherapy (6 Gy × 5 days) 19 Recurrent GBM REGN2810 (1 or 3 mg/kg) + radiotherapy (6 Gy × 5 days) 20 HIV and solid tumors 3 mg/kg REGN2810 21 Advanced NSCLC, previously 3 mg/kg REGN2810 + untreated Carboplatin + Paclitaxel (Full Dose) 22 Advanced Non-Squamous NSCLC, 3 mg/kg REGN2810 + Cisplatin + previously untreated Pemetrexed 23 Advanced Squamous NSCLC, 3 mg/kg REGN2810 + Cisplatin + previously untreated Gemcitabine 24 Cervical Cancer, recurrent or 3 mg/kg REGN2810 metastatic 25 Basal cell carcinoma, refractory to 3 mg/kg REGN2810 hedgehog pathway inhibition 26 Advanced Solid Tumor 3 mg/kg REGN2810

The initial planned treatment with REGN2810 is every 14 days for up to 48 weeks, with 24 weeks of follow-up observation. Radiation is administered a week after the first dose of REGN2810. Low-dose cyclophosphamide is administered to patients assigned to cyclophosphamide 1 day before each of the first 4 doses of REGN2810.

Study Duration

Patients receive up to 48 weeks of treatment, after which there is a 24 week follow-up period. A patient receives treatment until the 48 week treatment period is complete, or until disease progression, unacceptable toxicity, withdrawal of consent, or meeting of another study withdrawal criterion. After a minimum of 24 weeks of treatment, patients with confirmed complete responses (CR) may elect to discontinue treatment and continue with all relevant study assessments (eg, efficacy assessments). After a minimum of 24 weeks of treatment, patients with tumor burden assessments of stable disease (SD) or partial response (PR) that have been unchanged for 3 successive tumor evaluations may also elect to discontinue treatment and continue with all relevant study assessments (e.g., efficacy assessments).

Study Population

The target population for this study comprises patients with advanced malignancies who are not candidates for standard therapy, unwilling to undergo standard therapy, or for whom no available therapy is expected to convey clinical benefit; and patients with malignancies that are incurable and have failed to respond to or showed tumor progression despite standard therapy.

Inclusion criteria: A patient must meet with the following criteria to be eligible for inclusion in the study: (1) demonstrated progression of a solid tumor with no alternative standard-of-care therapeutic option available; (2) at least 1 lesion for response assessment. Patients assigned to radiotherapy require at least one additional lesion that can be safely irradiated while sparing the index lesions and for which radiation at the limited, palliative doses contemplated would be considered medically appropriate; (3) patients must have relapsed after, or be refractory to first-line therapy (and up to 2 prior lines of therapy) in the recurrent or metastatic disease setting and must have disease for which palliative radiation therapy is indicated; (4) patients with metastatic cancer with microsatellite instability (MSI) refractory to up to 2 prior lines of therapy; (5) Eastern Cooperative Oncology Group (ECOG) performance status ≤1; (6) more than 18 years old; (7) hepatic function: a. total bilirubin ≤1.5× upper limit of normal (ULN; if liver metastases ≤3×ULN), b. transaminases ≤3×ULN (or ≤5.0×ULN, if liver metastases), c. alkaline phosphatase (ALP)≤2.5×ULN (or 5.0×ULN, if liver metastases); (8) renal function: serum creatinine ≤1.5×ULN; (9) neutrophil count (ANC) ≥1.5×10⁹/L, c. platelet count ≥75×10⁹/L; (10) ability to provide signed informed consent; and (11) ability and willingness to comply with scheduled visits, treatment plans, laboratory tests, and other study-related procedures.

Study Treatments

REGN2810 is supplied as a liquid in sterile, single-use vials. Each vial contains a volume sufficient to withdraw 10 mL of REGN2810 at a concentration of 25 mg/mL. REGN2810 is administered in an outpatient setting as a 30 minute IV infusion. Each patient's dose depends on individual body weight. The dose of REGN2810 is adjusted each cycle for changes in body weight of ≥10%. REGN2810 is administered alone, or in combination with radiation and/or cyclophosphamide. Cyclophosphamide is administered at 200 mg/m2 or as a low dose (100 mg/m2).

Monotherapy

REGN2810 is administered in an outpatient setting by IV infusion over 30 minutes every 14 days for 48 weeks (ie, Days 1, 15±3, 29±3, and 43±3 of a 56 day cycle). Planned monotherapy regimens to be assigned may include: (i) 1 mg/kg IV infusion over 30 minutes every 14 days for 48 weeks; (ii) 3 mg/kg infusion over 30 minutes every 14 days for 48 weeks; (iii) 10 mg/kg infusion over 30 minutes every 14 days for 48 weeks; (iv) 0.3 mg/kg infusion over 30 minutes every 14 days for 48 weeks (if MTD is determined to be below 1 mg/kg); and (v) 200 mg flat dose IV infusion over 30 minutes every 14 days for 48 weeks.

Combination Therapy

Concomitant radiation therapy, cyclophosphamide, GM-CSF, carboplatin, and docetaxel is supplied through a prescription and their usage, dose, dose modifications, reductions, or delays, as well as any potential AEs resulting from their use, is tracked along with that of REGN2810.

Co-administration of REGN2810 and radiation: REGN2810 is administered by IV infusion over 30 minutes every 14 days for 48 weeks in combination with radiation treatment from day 8 to day 12. Planned combination REGN2810 and radiation therapy regimens may include:

-   -   1 mg/kg REGN2810 infusion over 30 minutes every 14 days for 48         weeks plus     -   30 Gy radiotherapy (6 Gy×5 times/week; given 1 week after the         first dose of REGN2810, preferably on consecutive days)     -   1 mg/kg REGN2810 infusion over 30 minutes every 14 days for 48         weeks plus     -   27 Gy radiotherapy (9 Gy×3 times/week; given 1 week after the         first dose of REGN2810, preferably not on consecutive days)     -   3 mg/kg REGN2810 infusion over 30 minutes every 14 days for 48         weeks plus     -   30 Gy radiotherapy (6 Gy×5 times/week; given 1 week after the         first dose of REGN2810, preferably on consecutive days)     -   0.3 mg/kg REGN2810 infusion over 30 minutes every 14 days for 48         weeks plus     -   27 Gy radiotherapy (9 Gy×3 times/week; given 1 week after the         first dose of REGN2810, preferably not on consecutive days)

Patients will receive either 30 Gy given as 5 fractions of 6 Gy administered daily starting 1 week after the first dose of REGN2810, or 27 Gy given as 3 fractions of 9 Gy administered every other day starting 1 week after the first dose of REGN2810. The lesion selected for radiation should be a lesion that can be safely irradiated with focal irradiation while sparing the index lesion(s), and for which radiation at the limited, palliative doses contemplated would be considered medically appropriate.

Co-administration of REGN2810 and cyclonhosphamide: REGN2810 is administered by IV infusion over 30 minutes every 14 days (2 weeks) for 48 weeks in combination with low dose cyclophosphamide 100 mg/m2 IV infusion every 14 days for 4 doses. Each of the 4 cyclophosphamide doses are administered 1 day before each of the first 4 REGN2810 doses (days −1, 14, 28, and 42 of the first 56 day cycle).

The planned combination REGN2810 and cyclophosphamide regimen is:

-   -   Cyclophosphamide 100 mg/m2 or 200 mg/m2 IV every 14 days (days         −1, 14, 28, and 42 of the first 56 day cycle) for a total of 4         doses; plus     -   3 mg/kg REGN2810 infusion over 30 minutes every 14 days for 48         weeks (provided monotherapy dose of 3 mg/kg<MTD; if 3 mg/kg>MTD,         dose will be 1 mg/kg.

Co-administration of REGN2810, radiation and cyclonhosphamide: The planned combination REGN2810, radiation, and cyclophosphamide regimen includes:

-   -   Cyclophosphamide 100 mg/m2 (low dose) IV every 14 days (days −1,         14, 28, and 42 of the first 56 day cycle) for a total of 4         doses; plus     -   27 Gy radiotherapy (9 Gy×3 times/week; given 7 or 8 days after         the first dose of REGN2810, preferably not on consecutive days)         OR 30 Gy radiotherapy (6 Gy×5 times/week; given 7 or 8 days         after the first dose of REGN2810, preferably on consecutive         days); plus     -   3 mg/kg REGN2810 infusion over 30 minutes every 14 days for 48         weeks (provided monotherapy dose of 3 mg/kg<MTD; if 3 mg/kg>MTD,         dose will be 1 mg/kg)

Co-administration of REGN2810, radiation and GM-CSF: The planned combination REGN2810, radiation, and GM-CSF regimen includes:

-   -   GM-CSF 250 mcg SC daily for 7 days, for four 7-day intervals         (days 1 through 7, 15 through 21, 29 through 35, and 43 through         49 of the first 56-day cycle); plus     -   27 Gy radiotherapy (9 Gy×3 times/week; given 1-week after the         first dose of REGN2810, preferably not on consecutive days);         plus     -   3 mg/kg REGN2810 infusion over 30 minutes every 14 days for 48         weeks (provided monotherapy dose of 3 mg/kg<MTD; if 3 mg/kg>MTD,         dose will be 1 mg/kg)

Co-administration of REGN2810, radiation, GM-CSF and cyclophosphamide: The planned combination REGN2810, radiation, GM-CSF, and cyclophosphamide regimen includes:

-   -   GM-CSF 250 mcg SC daily for 7 days, for four 7-day intervals         (days 1 through 7, 15 through 21, 29 through 35, and 43 through         49 of the first 56-day cycle); plus     -   27 Gy radiotherapy (9 Gy×3 times/week; given 1 week after the         first dose of REGN2810, preferably not on consecutive days);         plus     -   Cyclophosphamide 100 mg/m2 or 200 mg/m2 IV every 14 days (days         −1, 14, 28, and 42 of the first 56 day cycle) for a total of 4         doses; plus     -   3 mg/kg REGN2810 infusion over 30 minutes every 14 days for 48         weeks (provided monotherapy dose of 3 mg/kg<MTD; if 3 mg/kg>MTD,         dose will be 1 mg/kg)

Co-administration of REGN2810 and docetaxel with or without carboplatin: The suggested sequence of drug administration is docetaxel followed by carboplatin (if enrolled in a carboplatin-containing cohort), followed by REGN2810:

-   -   Docetaxel 30 mg/m2 IV over approximately 1 hour on days 1, 8,         29, and 36 of the first 56-day cycle. Dexamethasone 8 mg IV will         be administered prior to the first dose of docetaxel. For         subsequent docetaxel treatments, the dose of dexamethasone         premedication may be 8 mg or 4 mg, per investigator discretion     -   Carboplatin AUC 2 IV over approximately 30 minutes on days 1, 8,         29, and 36 of the first 56-day cycle. Carboplatin dosing should         use the Calvert formula on the carboplatin label. Creatinine         clearance should be calculated using the Cockcroft-Gault         equation.     -   3 mg/kg REGN2810 infusion over approximately 30 minutes every 14         days for 48 weeks

Procedures and Assessments

Screening procedures to be performed include serum beta-HCG, brain MRI, and chest X-rays.

Safety procedures include medical history, physical examination, vital signs, electrocardiogram (ECG), coagulation, immune safety assays (for patients treated with REGN2810), assessment of B symptoms and evaluation of performance status, clinical laboratory tests, AEs, and concomitant medications.

Efficacy procedures to be performed for tumor assessments include CT or MRI scans, 18F-fluorodeoxyglucose-positron emission tomography (FDG-PET) scans, and/or tumor biopsies. A CT or MRI for tumor assessment is performed at the screening visit (within 28 days prior to infusion) and during every cycle (approximately every 8 weeks) on day 56±3, and when disease progression is suspected. Additionally, for patients who have not progressed on study, tumor assessments are performed for follow-up visits 3, 5, and 7. Once the choice has been made to use CT scan or MRI, subsequent assessments are made using the same modality. Tumor response assessments are performed according to Response Evaluation Criteria in Solid Tumors RECIST version 1.1 (Eisenhauer et al 2009, Eur. J. Cancer 45: 228-247). Measurable lesions selected as target lesions for RECIST measurements are also included as index lesions for immune-related response criteria (irRC; Nishino et al 2013, Clin. Cancer Res. 19: 3936-3943). RECIST response is prioritized as statistical assessment of response rate. For an individual patient, irRC can inform the decision regarding whether to continue treatment at the discretion of the investigator due to the possibility of unconventional responses.

Blood samples for PK and anti-drug antibody (ADA) assessment are collected.

Study Variables

The primary variables in the study are DLT incidence and the incidence and severity of TEAEs and abnormal laboratory findings through 48 weeks of treatment.

The secondary variables are:

-   -   Antitumor activities assessed using the appropriate criteria for         the indication (described elsewhere herein):         -   Response Evaluation Criteria in Solid Tumors (RECIST;             Eisenhauer et al 2009, Eur. J. Cancer 45: 228-247) criteria             measured by CT or MRI         -   Other assessment criteria also are used for specific tumors             in which RECIST measurements are not the standard.         -   Immune-Related Response Criteria (irRC; Nishino et al 2013,             Clin. Cancer Res. 19: 3936-3943) applied to RECIST             measurements. In all cases, RECIST (or other tumor-specific             criteria) is the governing tool to determine PD, SD, CR, or             PR. The irRC is collected for clinical decisions and             information purposes.     -   Incidence of development of anti-REGN2810 antibodies     -   Antitumor activity measured by PFS and overall survival

For the purposes of this study, patients are re-evaluated for response every 8 weeks. Confirmatory scans are also obtained 4 weeks following initial documentation of objective response or progressive disease. Response and progression is evaluated in this study using the international criteria proposed by the revised Response Evaluation Criteria in Solid Tumors (RECIST) guideline (version 1.1; Eisenhauer et al 2009, Eur. J. Cancer 45: 228-247). Changes in the largest diameter (unidimensional measurement) of the tumor lesions and the shortest diameter in the case of malignant lymph nodes are used in the RECIST criteria.

Selection of Lesions

Measurable disease: Measurable lesions are defined as those that can be accurately measured in at least one dimension (longest diameter to be recorded) as ≥20 mm (≥2 cm) by chest x-ray or as ≥10 mm (≥1 cm) with CT scan, MRI, or calipers by clinical exam. All tumor measurements must be recorded in millimeters (or decimal fractions of centimeters). Note: See below for evaluation of radiated target lesions.

Malignant lymph nodes: To be considered pathologically enlarged and measurable, a lymph node must be ≥15 mm (≥1.5 cm) in short axis when assessed by CT scan (CT scan slice thickness recommended to be no greater than 5 mm [0.5 cm]). At baseline and in follow-up, only the short axis will be measured and followed.

Non-measurable disease: All other lesions (or sites of disease), including small lesions (longest diameter <10 mm [<1 cm] or pathological lymph nodes with ≥10 to <15 mm [≥1 to <1.5 cm] short axis), are considered non-measurable disease. Bone lesions, leptomeningeal disease, ascites, pleural/pericardial effusions, lymphangitis cutis/pulmonitis, inflammatory breast disease, and abdominal masses (not followed by CT or MRI), are considered as non-measurable. Note: Cystic lesions that meet the criteria for radiographically defined simple cysts should not be considered as malignant lesions (neither measurable nor non-measurable) since they are, by definition, simple cysts. ‘Cystic lesions’ thought to represent cystic metastases can be considered as measurable lesions, if they meet the definition of measurability described above. However, if non-cystic lesions are present in the same patient, these are preferred for selection as target lesions.

Target lesions: All measurable lesions up to a maximum of 2 lesions per organ and 5 lesions in total, representative of all involved organs, should be identified as target lesions and recorded and measured at baseline. Target lesions are selected on the basis of their size (lesions with the longest diameter), are representative of all involved organs, but in addition include those that lend themselves to reproducible repeated measurements. It may be the case that, on occasion, the largest lesion does not lend itself to reproducible measurement in which circumstance the next largest lesion which can be measured reproducibly is selected. A sum of the diameters (longest for non-nodal lesions, short axis for nodal lesions) for all target lesions is calculated and reported as the baseline sum diameters. If lymph nodes are to be included in the sum, then only the short axis is added into the sum. The baseline sum diameters are used as reference to further characterize any objective tumor regression in the measurable dimension of the disease.

Non-target lesions: All other lesions (or sites of disease) including any measurable lesions over and above the 5 target lesions are identified as non-target lesions and are recorded at baseline. Measurements of these lesions are not required, but the presence, absence, or in rare cases unequivocal progression of each is noted throughout follow-up.

Methods for Evaluation of Measurable Disease

All measurements are taken and recorded in metric notation using a ruler or calipers. All baseline evaluations are performed as closely as possible to the beginning of treatment and never more than 4 weeks before the beginning of the treatment. The same method of assessment and the same technique should be used to characterize each identified and reported lesion at baseline and during follow-up. Imaging-based evaluation is preferred to evaluation by clinical examination unless the lesion(s) being followed cannot be imaged but are assessable by clinical exam.

Clinical lesions: Clinical lesions are only considered measurable when they are superficial (eg, skin nodules and palpable lymph nodes) and >10 mm (≥1 cm) diameter as assessed using calipers (e.g., skin nodules). In the case of skin lesions, documentation by color photography, including a ruler to estimate the size of the lesion, is recommended.

Chest x-ray: Lesions on chest x-ray are acceptable as measurable lesions when they are clearly defined and surrounded by aerated lung. However, CT is preferable.

Conventional CT and MRI: This guideline has defined measurability of lesions on CT scan based on the assumption that CT slice thickness is 5 mm (0.5 cm) or less. If CT scans have slice thickness greater than 5 mm (0.5 cm), the minimum size for a measurable lesion should be twice the slice thickness. MRI is also acceptable in certain situations.

PET-CT: If the CT performed as part of a PET-CT is of identical diagnostic quality to a diagnostic CT (with IV and oral contrast), then the CT portion of the PET-CT can be used for RECIST measurements and can be used interchangeably with conventional CT in accurately measuring cancer lesions over time.

Ultrasound: Ultrasound is not useful in assessment of lesion size and should not be used as a method of measurement. If new lesions are identified by ultrasound in the course of the study, confirmation by CT or MRI is advised. If there is concern about radiation exposure at CT, MRI may be used instead of CT in selected instances.

Endoscopy, Laparoscopy: The utilization of these techniques for objective tumor evaluation is not advised. However, such techniques may be useful to confirm complete pathological response when biopsies are obtained or to determine relapse in trials where recurrence following complete response (CR) or surgical resection is an endpoint.

Tumor markers: Tumor markers alone cannot be used to assess response. If markers are initially above the upper normal limit, they must normalize for a patient to be considered in complete clinical response.

Cytology, Histology: These techniques can be used to differentiate between partial responses (PR) and complete responses (CR) in rare cases (eg, residual lesions in tumor types, such as germ cell tumors, where known residual benign tumors can remain). The cytological confirmation of the neoplastic origin of any effusion that appears or worsens during treatment when the measurable tumor has met criteria for response or stable disease is mandatory to differentiate between response or stable disease (an effusion may be a side effect of the treatment) and progressive disease.

FDG-PET: While FDG-PET response assessments need additional study, it is sometimes reasonable to incorporate the use of FDG-PET scanning to complement CT scanning in assessment of progression (particularly possible ‘new’ disease). New lesions on the basis of FDG-PET imaging can be identified according to the following algorithm: a. Negative FDG-PET at baseline, with a positive FDG-PET at follow-up is a sign of PD based on a new lesion. b. No FDG-PET at baseline and a positive FDG-PET at follow-up: If the positive FDG-PET at follow-up corresponds to a new site of disease confirmed by CT, this is PD. If the positive FDG-PET at follow-up is not confirmed as a new site of disease on CT, additional follow-up CT scans are needed to determine if there is truly progression occurring at that site (if so, the date of PD will be the date of the initial abnormal FDG-PET scan). If the positive FDG-PET at follow-up corresponds to a pre-existing site of disease on CT that is not progressing on the basis of the anatomic images, this is not PD. c. FDG-PET may be used to upgrade a response to a CR in a manner similar to a biopsy in cases where a residual radiographic abnormality is thought to represent fibrosis or scarring. The use of FDG-PET in this circumstance should be prospectively described in the protocol and supported by disease-specific medical literature for the indication. However, it must be acknowledged that both approaches may lead to false positive CR due to limitations of FDG-PET and biopsy resolution/sensitivity. Note: A ‘positive’ FDG-PET scan lesion means one which is FDG avid with an uptake greater than twice that of the surrounding tissue on the attenuation corrected image.

Response Criteria for Evaluation of Target Lesions

-   -   Complete Response (CR): Disappearance of all target lesions. Any         pathological lymph nodes (whether target or non-target) must         have reduction in short axis to <10 mm (<1 cm).     -   Partial Response (PR): At least a 30% decrease in the sum of the         diameters of target lesions, taking as reference the baseline         sum diameters.     -   Progressive Disease (PD): At least a 20% increase in the sum of         the diameters of target lesions, taking as reference the         smallest sum on study (this includes the baseline sum if that is         the smallest on study). In addition to the relative increase of         20%, the sum must also demonstrate an absolute increase of at         least 5 mm (0.5 cm). (Note: the appearance of one or more new         lesions is also considered progressions).     -   Stable Disease (SD): Neither sufficient shrinkage to qualify for         PR nor sufficient increase to qualify for PD, taking as         reference the smallest sum diameters while on study.

Response Criteria for Evaluation of Non-Target Lesions

-   -   Complete Response (CR): Disappearance of all non-target lesions         and normalization of tumor marker level. All lymph nodes must be         non-pathological in size (<10 mm [<1 cm] short axis). Note: If         tumor markers are initially above the upper normal limit, they         must normalize for a patient to be considered in complete         clinical response.     -   Non-CR/Non-PD: Persistence of one or more non-target lesion(s)         and/or maintenance of tumor marker level above the normal         limits.     -   Progressive Disease (PD): Appearance of one or more new lesions         and/or unequivocal progression of existing non-target lesions.         Unequivocal progression should not normally trump target lesion         status. It must be representative of overall disease status         change, not a single lesion increase.

Immune-Related Response Criteria

Immune-related response criteria differ from RECIST (Version 1.1) in that the sum of the longest diameters of all target lesions and new lesions if any are used to determine response. The presence of new lesions per se does not determine progression; the total tumor burden is considered.

Evaluation of Target Lesions

-   -   Complete Response (CR): Disappearance of all target lesions. Any         pathological lymph nodes (whether target or non-target) must         have reduction in short axis to <10 mm (<1 cm).     -   Partial Response (PR): At least a 30% decrease in the sum of the         diameters of target lesions, including new lesions, taking as         reference the baseline sum diameters.     -   Progressive Disease (PD): At least a 20% increase in the sum of         the diameters of target lesions, including new lesions, taking         as reference the smallest sum on study (this includes the         baseline sum if that is the smallest on study). In addition to         the relative increase of 20%, the sum must also demonstrate an         absolute increase of at least 5 mm (0.5 cm).     -   Stable Disease (SD): Neither sufficient shrinkage to qualify for         PR nor sufficient increase to qualify for PD, taking as         reference the smallest sum diameters while on study and         including the measurements of new lesions.

Evaluation of Non-Target Lesions

-   -   Complete Response (CR): Disappearance of all non-target lesions         and normalization of tumor marker level. All lymph nodes must be         non-pathological in size (<10 mm [<1 cm] short axis). Note: If         tumor markers are initially above the upper normal limit, they         must normalize for a patient to be considered in complete         clinical response.     -   Non-CR/Non-PD: Persistence of one or more non-target lesion(s)         and/or maintenance of tumor marker level above the normal         limits.     -   Progressive Disease (PD): Unequivocal progression of existing         non-target lesions. Unequivocal progression should not normally         trump target lesion status. It must be representative of overall         disease status change, not a single lesion increase. Although a         clear progression of “non-target” lesions only is exceptional,         the opinion of the treating physician should prevail in such         circumstances, and the progression status should be confirmed at         a later time.

Evaluation of Overall Response Criteria

The best overall response is the best response recorded from the start of the treatment until disease progression/recurrence (taking as reference for progressive disease the smallest measurements recorded since the treatment started). The patient's best response assignment will depend on the achievement of both measurement and confirmation criteria. Revised Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 (Eisenhauer et al 2009, Eur. J. Cancer 45: 228-247) and immune-related response criteria (irRC; Nishino et al 2013, Clin. Cancer Res. 19: 3936-3943) are summarized in Tables 10 and 11 below.

TABLE 10 Response according to Revised RECIST (Version 1.1) Best Overall Response when Target Non-target New Overall Confirmation Lesions Lesions Lesions Response is Required CR CR No CR ≥4 weeks confirmation CR Non-CR/ No PR ≥4 weeks Non-PD confirmation CR Not No PR ≥4 weeks evaluated confirmation PR Non-CR/ No PR ≥4 weeks Non-PD/ confirmation not evaluated SD Non-CR/ No SD Documented at Non-PD/ least once ≥4 not weeks from evaluated baseline PD Any Yes or PD No prior SD, No PR or CR Any PD Yes or PD No prior SD, No PR or CR Any Any Yes PD No prior SD, PR or CR CR: complete response; PD: progressive disease; PR: partial response; SD: stable disease

TABLE 11 Immune-related Response Criteria Evaluation Best Overall Response when Target Non-target New Overall Confirmation Lesions Lesions Lesions Response is Required CR CR No CR ≥4 weeks confirmation CR Non-CR/ No PR ≥4 weeks Non-PD confirmation CR Not No PR ≥4 weeks evaluated confirmation PR Non-CR/ Yes or PR ≥4 weeks Non-PD/ No confirmation not evaluated SD Non-CR/ Yes or SD Documented at Non-PD/ No least once ≥4 not weeks from evaluated baseline PD Any Yes or PD No prior SD, No PR or CR Any PD Yes or PD No prior SD, No PR or CR CR: complete response; PD: progressive disease; PR: partial response; SD: stable disease

Evaluation of Radiated Target Lesions

Radiated target lesions are evaluated with a modified version of the international criteria proposed by the Response Evaluation Criteria in Solid Tumors (RECIST) Committee, version 1.1. Additional definitions beyond the RECIST 1.1 guidelines specific to this protocol are incorporated to define local control.

The response criteria for radiated lesions are as follows:

Local enlargement (LE): At least a 20% increase in the LD of target lesion, taking as reference the smallest LD recorded since the treatment started. Ideally, this determination will be made based on CT image evaluation.

Local failure (LF): Refers to the primary treated tumor after protocol therapy and corresponds to meeting both of the following two criteria: (1) Increase in tumor dimension of 20% as defined above for local enlargement (LE); (2) The measurable tumor with criteria meeting LE should be avid on Positron Emission Tomography (PET) imaging with uptake of a similar intensity as the pretreatment staging PET, OR the measurable tumor should be biopsied confirming viable carcinoma.

Local control (LC): The absence of local failure.

The longest diameter (LD) for the radiated target lesion calculated from the treatment-planning CT scan, using appropriate tissue-specific windowing, is reported as the baseline LD. The baseline LD is used as the reference by which to characterize the objective tumor. For follow-up assessment, diagnostic CT scans performed using a 5 mm contiguous reconstruction algorithm using pulmonary windowing taken as part of scheduled protocol follow-up are preferred as the method of evaluation for response. When CT scans are not available, MRI or x-ray determination is allowed, as long as the target lesion is clearly visible.

Results

REGN2810 alone and in combination is safe and well-tolerated by patients. Administration of REGN2810 alone or in combination with other treatment modalities inhibits tumor growth and/or promotes tumor regression in patients with advanced solid tumors. Overall response rate is better for combination therapy with radiation as compared to monotherapy.

60 patients with advanced solid malignancies (47% with four or more prior therapies) have been treated to-date. The advanced solid malignancies include colorectal cancer, head and neck cancer, breast cancer, soft tissue sarcoma, adrenal cancer, anal cancer, cancer of the appendix, bladder cancer, cervical cancer, endometrial cancer, esophageal cancer, liver cancer, non-small cell lung adenocarcinoma, ovarian cancer, pancreatic cancer, prostate cancer, renal sarcomatoid, salivary gland cancer, non-melanoma skin cancer, Merkel cell carcinoma, squamous cell carcinoma, basal cell carcinoma, small intestine cancer, thyroid cancer and uterine cancer.

Forty-two patients (70%) experienced one or more treatment-related adverse events (AEs). The most common treatment-related AEs were fatigue (28.34), arthralgia (16.7%) and nausea (11.7%). Of the 60 patients evaluated for tumor responses, there were 11 (18.3%) objective responses (PR/CR), while 31 patients (51.7%) showed disease control (CR/PR/SD). In the 36 patients who received combination therapy including radiation therapy, objective response was seen in 6 patients (16.7%) and disease control in 19 patients (52.80). In the 24 patients who did not receive radiation therapy, objective response was seen in five patients (20.8%) and disease control was seen in 12 patients (50%). Table 12 shows a summary of responders.

TABLE 12 Summary of responders No. Prior Subject Lines of Best Best % ID Dose Cohort Cancer Type Therapy Response Reduction 41 R2810: 1 mg/kg Cholangiocarcinoma 5 PR −41.2 50 R2810: 1 mg/kg Cutaneous squamous 2 CR −100.0 cell carcinoma 43 R2810: 10 mg/kg Soft tissue 5 PR −49.1 sarcoma 37 R2810: 10 mg/kg Basal cell 1 PR −36.7 carcinoma 36 R2810: 3 mg/kg + Soft tissue 5 PR −33.3 CPA: 200 mg/m2 sarcoma 47 R2810: 1 mg/kg + Cervix squamous 4 PR −66.7 XRT: 6 Gy × 5 cell carcinoma 46 R2810: 1 mg/kg + Anal squamous 3 PR −57.1 XRT: 9 Gy × 3 cell carcinoma 49 R2810: 1 mg/kg + Cervix squamous 3 CR −100.0 XRT: 9 Gy × 3 cell carcinoma 48 R2810: 3 mg/kg + Merkel Cell 1 PR −72.5 XRT: 6 Gy × 5 Carcinoma 42 R2810: 3 mg/kg + Small intestine 2 PR −46.7 XRT: 6 Gy × 5 adenocarcinoma 44 R2810: 3 mg/kg + Ovarian serous 6 PR −52.4 XRT: 9 Gy × 3 carcinoma

Among the responders, the median time to response for monotherapy was 113 days (range 52-226) and for patients with radiation therapy was 59 days (range 56-113).

Example 8: Case Reports of PD-1 Blockade with Monoclonal Antibody REGN2810 Achieving Durable Objective Responses in Metastatic, Non-Melanoma Skin Cancers: Basal Cell Carcinoma and Cutaneous Squamous Cell Carcinoma INTRODUCTION

Basal cell carcinoma (BCC) and cutaneous squamous cell carcinoma (CSCC) share exposure to UV light as the dominant risk factor, and these tumors are therefore hypermutated (Chalmers et al 2016, AACR Ann. Meeting, Abs 3576). In other malignancies, high mutation burden has been associated with clinical benefit from therapy with antibodies directed against the PD-1 immune checkpoint [Le et al 2015, New Engl. J. Med. May 30 (Epub ahead of print)]. Highly mutated tumors are more likely to express immunogenic tumor neoantigens that attract effector T cells that can be unleashed by blockade of the PD-1 immune checkpoint (Mandal and Chan 2016, Cancer Discov. 6: 1-12). This Example describes a patient with metastatic BCC and a patient with metastatic CSCC who were treated with REGN2810, a fully human anti-PD-1 monoclonal antibody in an ongoing phase 1 trial (NCT02383212; described in Example 7 herein).

Case Report 1

The patient was a 66 year-old woman who was diagnosed with a stage 1 BCC arising on the left aspect of the chin, which was resected with Mohs surgery. A localized recurrence in the same location was identified 2 years later, and a wide local excision revealed invasion into the left mandible and involvement of one out of 18 lymph nodes. The patient received adjuvant radiation and remained in remission for 4 years, when enlarging lung nodules observed on surveillance chest imaging were biopsied and confirmed the presence of metastatic BCC. The patient subsequently received the Hedgehog pathway inhibitor (HHI) vismodegib for 5 months. She initially responded but discontinued because of progressive disease.

Six months after the vismodegib therapy and upon continued slow progression, the patient enrolled on the phase 1 study of REGN2810 to a cohort receiving 10 mg/kg IV every 2 weeks, and received her first dose. Two lung metastases were followed as target lesions. Response assessments at the end of 8 weeks (3% increase) and 16 weeks (10% decrease) demonstrated stable disease by RECIST criteria. The response assessment at the end of 24 weeks demonstrated a reduction in tumor measurements of 37% (FIG. 14A), and this was confirmed at 32 weeks. The patient has tolerated treatment well, and continues REGN2810, on treatment for 10+ months.

Case Report 2

The patient was a 52 year-old man who was diagnosed with cutaneous squamous cell carcinoma of the left cheek. He underwent Mohs surgery with clear margins. He experienced multiple recurrences, and underwent at least 9 additional Mohs surgeries. He underwent wide local excision over left mandible 4 years later, and left parotidectomy subsequently in 20 months. Also, adjuvant radiotherapy was administered to left cheek, left mandible, left neck (with concurrent cetuximab), and bilateral neck (with concurrent carboplatin). Other systemic therapies were capecitabine, and cisplatin+docetaxel. Ten years after the initial diagnosis, he underwent excision with clear margins for a 2.2 cm in-scar recurrence of the left neck. Subsequently, invasive CSCC at C4-C5 vertebral bodies necessitated emergent decompression of cervical spinal cord with C4-C5 anterior corpectomy and C4-C6 posterior laminectomy. He also developed lower extremity muscle weakness thought to be due to perineural involvement and required the use of a walker for ambulation.

He was enrolled on the phase 1 study in the first cohort, receiving 1 mg/kg REGN2810 every two weeks. Within weeks of beginning treatment, his lower extremity strength gradually returned and he no longer requires the use of the walker. Response at Week 16 is shown in FIG. 14B. Complete radiologic response of the left neck lesion was achieved at Week 40. The patient completed the planned 48 weeks of protocol treatment with REGN2810. He continues in close active follow up with his medical oncologist without clinical or radiographic evidence of disease recurrence.

DISCUSSION

This Example discloses the first confirmed partial response in a patient with metastatic BCC treated with a PD-1 inhibitor (REGN2810), as well as an ongoing durable complete response in a patient with metastatic CSCC. The deep and sustained responses of these heavily pretreated patients to anti-PD-1 monotherapy in this phase 1 study are consistent with the hypothesis that high mutation burden in BCC and CSCC would elicit antitumor cellular immunity that could be unleashed by blockade of the PD-1/PD-L1 checkpoint pathway.

This Example supports a general principle that UV-associated skin cancers beyond melanoma are sensitive to PD-1 blockade. A reductionist model would predict that UV-associated tumors with higher load of non-synonymous mutations will be more responsive to PD-1 blockade than those with lower mutation load.

Example 9: Safety and Efficacy of Anti-PD-1 Antibody in Patients with Unresectable Locally Advanced or Metastatic Cutaneous Squamous Cell Carcinoma (CSCC) Background

There is no established standard of care for unresectable locally advanced or metastatic CSCC. Due to UV-induced DNA damage, most CSCCs are hyper-mutated. Therefore, these tumors may be responsive to PD-1 checkpoint blockade. This Example describes patients with locally advanced or metastatic CSCC who were treated with REGN2810, a fully human anti-PD-1 monoclonal antibody in an ongoing phase 1 trial (NCT02383212; described in Example 7 herein).

Methods

Expansion cohorts (ECs) in the phase 1 study of REGN2810 enrolled patients with distantly metastatic CSCC (EC 7) and locally advanced CSCC (EC8) (Table 9). All patients received 3 mg/kg REGN2810 by vein every 2 weeks for up to 48 weeks. Research biopsies were performed at baseline and Day 29 (and at progression, if possible). To determine overall response rate, tumor measurements were performed every 8 weeks according to RECIST 1.1.

Results

25 patients were enrolled (10 in EC 7 and 15 in EC 8): median age, 72.5 y (range, 56-88 y); median PS 1 (range, 0-1); 20 M:5F; median number of prior systemic therapy regimens, 1 (range, 0-3). Median exposure to REGN2810 was 6 doses (range, 1-22). The most common treatment-related adverse events of any grade were fatigue (16.7%), nausea, arthralgia, and rash (8.3% each). Each of the following ≥Grade 3 related adverse events (AEs) occurred once: AST elevation, ALT elevation, arthralgia, and rash.

Overall response rate (uPR+PR+CR) and disease control rate (ORR+SD) were 48% (11/23; 3 uPR, 5 PR, 2 CR, 1 uCR) and 70% (16/23, including 5 SD), respectively. Two patients are not yet evaluable. Median PFS and Median OS are calculated, and only one patient has experienced PD during REGN2810 treatment after initial response. Correlative science studies are in process, including whole exome tumor DNA sequencing.

CONCLUSION

REGN2810 demonstrates robust antitumor activity in patients with advanced CSCC.

Example 10: Clinical Trial of Anti-PD-1 Antibody Combined with Hypofractionated Radiation Therapy Versus Standard of Care in Patients ≥65 Years of Age with Newly Diagnosed Glioblastoma INTRODUCTION

Glioblastoma is a deadly disease with a median survival of approximately 16 months in newly diagnosed patients (nGBM), and approximately 9 months in the recurrent setting (rGBM) (Friedman et al, 2009, J. Clin. Oncol. 27: 4733-4740). The current standard of care for patients with newly diagnosed glioblastoma is radiation (60 Gy over 6 weeks) with concurrent temozolomide (TMZ) followed by adjuvant temozolomide (Stupp et al, 2005, N. Engl. J. Med. 352: 987-996), although subgroup analyses suggests that the addition of temozolomide may not improve efficacy in older individuals (Laperriere et al, 2013, Cancer Treat. Rev. 39: 350-357).

This Example describes a phase 3 study to evaluate efficacy of an anti-PD-1 antibody in combination with hypofractionated radiation therapy (hfRT) versus standard of care (SoC) in terms of overall survival in patients ≥65 years old with nGBM.

The exemplary anti-PD-1 antibody used in this study is REGN2810 (also known as H4H7798N as disclosed in US20150203579), a fully human monoclonal anti-PD-1 antibody comprising a heavy chain comprising the amino acid sequence of SEQ ID NO: 9 and a light chain comprising the amino acid sequence of SEQ ID NO: 10; an HCVR/LCVR amino acid sequence pair comprising SEQ ID NOs: 1/2; and heavy and light chain CDR sequences comprising SEQ ID NOs: 3-8.

Study Objectives

The primary objective of the study is to evaluate efficacy in terms of overall survival (OS) of REGN2810 given in combination with hfRT versus standard of care for patients ≥65 years old with nGBM.

The secondary objective of the study is to determine an improvement in progression-free survival (PFS).

The other objectives of the study are: (i) improvement in Objective response rate (ORR), duration of response, and duration of disease control; (ii) clinical assessment using Neurologic Assessment in Neuro-Oncology (NANO) scale; (iii) safety; (iv) improvement in Quality of life (QoL) and mental status; (v) changes in edema and steroid use; (vi) REGN2810 concentration in serum and anti-REGN2810 antibodies; and (vii) to explore potential pharmacodynamic, predictive or prognostic biomarkers.

Study Design

This is a 2:1 randomized phase 3 study of REGN2810, a fully human antibody to PD-1, combined with hypofractionated radiation therapy versus standard of care in patients ≥65 years of age with newly diagnosed glioblastoma. Patients are randomized to REGN2810 in combination with hypofractionated radiation therapy versus standard of care in a 2:1 ratio with methylation status (methylated vs. unmethylated vs. undetermined) and extent of resection (partial vs. gross total resection) as stratification factors. Efficacy is assessed by overall survival.

nGBM patients who are candidates for radiation therapy are randomized in a 2:1 ratio to receive one of the following treatments:

-   -   Investigational therapy: 3 mg/kg REGN2810 IV (every 2 weeks)         plus hypofractionated RT (6 Gy×5, second week only). Radiation         therapy is provided in Week 2 of Cycle 1, but not subsequent         cycles.     -   Comparator therapy: standard of care TMZ (oral, 75 mg/m², daily)         in combination with standard RT (5 daily radiation         fractions/week of 2 Gy) for 6 weeks, followed by adjuvant TMZ         (oral, 150 mg/m2 to 200 mg/m² 5 days/28 days) for 6 cycles.         Radiation therapy is provided in the first 6 week cycle only.

Study Duration

The study consists of a 28-day screening period, after which eligible patients may have up to twelve 56-day (8-week) treatment cycles for a total of up to 96 weeks of treatment. During the screening period (day −28 to day −1), all eligible patients are required to have a pre-treatment tumor resection available (partial or full resection) or biospy for central pathology confirmation and MGMT methylation determination and confirmation.

After day 1/baseline, patients return to the clinic during cycle 1 on days 8±3, 15±3, 29±3, 43±3, and 56±3. For each subsequent 8-week cycle (cycles 2-12), patients return to the clinic on days 1, 15±3, 29±3, 43±3, and 56±3. Tumor assessments (brain MRI, iRANO and NANO assessments, MMSE, and EORTC QLQ-C30/BN20 questionnaires) are made at day 1/baseline and at the end of each treatment cycle. Extensive safety evaluations occur on day 1 of each cycle; routine safety evaluations will be conducted at each visit. Samples for assessment of biomarkers (cellular and molecular, described herein) related to REGN2810 treatment exposure, clinical activity, or underlying disease are also collected.

During the 24-week follow-up period, patients return to the clinic 21 to 42 days after the last study treatment for the first follow-up visit. Subsequent follow-up visits (follow-up visit 2 through follow-up visit 7) occur every 28 days±7 days. Tumor assessments (brain MRI, iRANO and NANO assessments, MMSE, and EORTC QLQ-C30/BN20 questionnaires) are made at follow-up visit 3, follow-up visit 5, and follow-up visit 7. Extensive safety evaluations occur during the first follow-up visit; routine safety evaluations will be conducted at subsequent follow-up visits. Samples for assessment of biomarkers (cellular and molecular, described herein) related to REGN2810 treatment exposure, clinical activity, or underlying disease are collected.

Target Population

The target population comprises patients ≥65 years old with nGBM.

Inclusion Criteria: A patient must meet the following criteria to be eligible for inclusion in the study: (1) newly diagnosed primary glioblastoma with histological confirmation, ≤5 cm in maximum diameter, who has had partial or complete surgical resection; (2) Eastern Cooperative Oncology Group (ECOG) performance status 0-2; (3) 65 years old; (4) Hepatic function: (a) Total bilirubin ≤1.5×upper limit of normal; (b) ALT and AST≤3×ULN; (c) Alkaline phosphatase (ALP) ≤2.5×ULN; (5) Renal function: Serum creatinine ≤1.5×ULN; (6) Bone marrow function: Hemoglobin ≥9.0 g/dL; Absolute neutrophil count (ANC) ≥1.5×10⁹/L; Platelet count ≥75×10⁹/L; (7) Able to read, understand, and willing to sign the ICF; and (8) Ability and willingness to comply with scheduled visits, treatment plans, laboratory tests, and other study-related procedures.

Exclusion Criteria: A patient who meets any of the following criteria will be excluded from the study: (1) Any prior treatment for GBM (other than surgery); (2) Have known contraindication to Gd-MRI; (3) Ongoing or recent (within 5 years) evidence of significant autoimmune disease that required treatment with systemic immunosuppressive treatments, which may suggest risk for immune-related adverse events (irAEs). The following are not exclusionary: vitiligo, childhood asthma that has resolved, residual hypothyroidism that requires only hormone replacement, or psoriasis that does not require systemic treatment. (4) Ongoing systemic corticosteroid treatment, with the exception of corticosteroid use for other (non-tumor and non-immunosuppressive) indications up to a maximum of 10 mg/day of prednisone or equivalent. (5) Primary tumors located in the brainstem, spinal cord, or any secondary brain tumor active infection requiring therapy, including known infection with human immunodeficiency virus, or active infection with hepatitis B or hepatitis C virus. (6) History of pneumonitis within the last 5 years. (7) Any investigational or antitumor treatment within 30 days prior to the initial administration of REGN2810. (8) History of documented allergic reactions or acute hypersensitivity reaction attributed to treatment with antibody therapies in general, or to agents specifically used in the study. (9) Inadequately controlled hypertension (defined as systolic blood pressure >150 mm Hg and/or diastolic blood pressure >100 mm Hg) (10) Known allergy to doxycycline or tetracycline. (Precaution due to presence of trace components in REGN2810.) (11) Prior history of hypetensive crisis or hypertensive encephalophathy (12) History within the last 5 years of an invasive malignancy other than the one treated in this study, with the exception of resected/ablated basal or squamous-cell carcinoma of the skin or carcinoma in situ of the cervix, or other local tumors considered cured by local treatment. (13) Acute or chronic psychiatric problems that, under the evaluation of the investigator, make the patient ineligible for participation (14) Use of Novocure Tumor Treating Fields (Optune NovoTTF-100A device) at screening. Planned or anticipated use of Novocure Tumor Treating Fields during study participation (15) Prior treatment with carmustine wafers (16) Continued sexual activity in men who are unwilling to practice adequate contraception during the study.

Study Treatments

Patients receive one of the following treatment regimens:

Investigational therapy: 3 mg/kg REGN2810 (administered IV infusion over 30 minutes every 2 weeks for up to 96 weeks) plus hfRT in Week 2 of Cycle 1

Comparator: standard of care TMZ (oral, 75 mg/m2, daily) in combination with standard RT (5 daily radiation fractions/week of 2 Gy) for 6 weeks, followed by adjuvant TMZ (oral, 150 mg/m2 to 200 mg/m² 5 days/28 days) for 6 cycles. Radiation therapy is provided in the first cycle only.

REGN2810 is supplied as a liquid in sterile, single-use vials. Each vial contains a volume sufficient to withdraw 10 mL of REGN2810 at a concentration of 25 mg/mL. REGN2810 is administered as a 30 minute IV infusion. Each patient's dose will depend on individual body weight. The dose of REGN2810 must be adjusted each cycle for changes in body weight of ≥10%.

Radiation Therapy: Patients in the control arm receive standard radiotherapy (60 Gy over 6 weeks). Patients in the experimental treatment group receive hfRT (6 Gy×5 daily fractions) administered 1 week after the first dose of REGN2810.

REGN2810 plus Radiation (Investigational Treatment): REGN2810 is administered by IV infusion over 30 minutes every 14 days for 96 weeks in combination with hfRT from day 8 to day 12.

Planned combination REGN2810 and hfRT regimen: 3 mg/kg REGN2810 infusion over 30 minutes every 14 days for 96 weeks plus radiation therapy (hfRT at 6 Gy×5 daily fractions; given 1 week after the first dose of REGN2810, preferably on consecutive days).

Specifications for Radiation Therapy: Patients receive 30 Gy given as 5 fractions of 6 Gy administered daily starting 1 week after the first dose of REGN2810.

Comparator Arm: Standard of Care: TMZ (oral, 75 mg/m², daily) in combination with standard RT (5 daily radiation fractions/week of 2 Gy) for 6 weeks, followed by adjuvant oral TMZ. The dose of TMZ is 150 mg/m² for the first 5 days of the first adjuvant cycle, and is increased 200 mg/m² for 5 days/28 days starting with the second cycle if there is no unacceptable hematologic toxicities with the first adjuvant cycle.

If, during the first adjuvant cycle, all non-hematologic toxicities observed are grade ≤2 (except alopecia, nausea and vomiting) and platelets are ≥100×109/L and ANC>=1.5×109/L, then the TMZ dose should be escalated to dose level 1 (200 mg/m²) and this dose should be used as the starting dose for subsequent cycles. If after cycle 1 TMZ has to be delayed because of ongoing non-hematologic toxicities of grade ≥2, then no escalation is possible. If the dose was not escalated at the second cycle, then the dose should not be escalated in subsequent cycles.

Treatments for CNS Edema: Any patient who develops symptomatic intracranial edema during the study has REGN2810 dosing and radiation therapy held until the edema subsides.

For patients who develop intracranial edema, bevacizumab is administered IV, as needed (PRN), at a reduced dose from the standard (suggested dose of 5 mg/kg Q2W for up to 3 doses, not more than 10 mg/kg Q2W per dose), unless contraindicated (e.g., unless the patient had surgery within the past 28 days).

If bevacizumab does not resolve the intracranial edema, systemic corticosteroids, in addition to or as replacement for bevacizumab, at the lowest dose deeded to be appropriate for symptom management may be administered. For patients who are bevacizumab intolerant corticosteroids are used at a dose deeded to be appropriate for symptom management.

Study Variables

The primary efficacy endpoint is overall survival (OS), which is defined as the time interval from the date of randomization to the date of death due to any cause.

The key secondary endpoint is progression free survival (PFS), which is defined as the time interval from the date of randomization to the date of first observation of disease progression or the date of death (due to any cause). Disease progression is determined by iRANO criteria.

The other secondary efficacy endpoints are:

Objective response rate (ORR): defined as the proportion of patients with confirmed complete response (CR) or confirmed partial response (PR), defined by Immunotherapy Response Assessment in Neuro-Oncology (iRANO) criteria relative to the total number of patients in the analysis population.

Duration of response: determined for patients with best overall response of CR or PR. Duration of response is measured from the time measurement criteria are first met for CR/PR (whichever is first recorded) until the first date of recurrent or progressive disease (radiographic), or death due to any cause.

Duration of disease control: determined for patients with best overall response of SD, CR, or PR. Duration of disease control is measured from the start of treatment until the first date of recurrent or progressive disease (radiographic), or death due to any cause.

Quality of Life and Symptom Control Variables: The quality of life and symptom control variables are:

-   -   Five functional scales, three symptom scales, one global measure         of health status and six single-item scales assessing symptoms         using the EORTC QLQ-C30 questionnaires during the study     -   Four scales and seven single items using the EORTC QLQ-BN20         questionnaires during the study     -   Clinical assessment using NANO;     -   The total score of the MMSE during the study     -   Use of corticosteroid at baseline, cumulative corticosteroid use         during the study, and the duration of steroid-free or low dose         steroid use during the progression-free period of study     -   Use of bevacizumab PRN at baseline, cumulative bevacizumab PRN         during the study, and the duration of bevacizumab-free during         the progression-free period of study

Exploratory Biomarker Variables: Other endpoint includes pharmacodynamic, prognostic, and predictive biomarkers related to clinical response, mechanism of action, and possible AEs associated with REGN2810 after treatment. The biomarker variables include:

-   -   Expression levels of immune checkpoint receptors PD-L1, GITR,         and LAG3, as well as other potential biomarkers (e.g., EGFRvIII,         Ki67, etc) in tumor samples;     -   Number and distribution of TILs in tumor samples;     -   IDH1 mutational status, microsatelite instabilty (MSI), and         mutational burden in tumor samples;     -   Circulating biomarkers including cytokines and angiogenic         factors;     -   Cell subsets and expression levels of biomarkers of interest in         PBMCs;     -   MGMT promoter methylation status (also used for stratification)

Other variables include REGN2810 concentration in serum (pharmacokinetic variables) and development of anti-REGN2810 antibodies.

Procedures and Assessments

After a screening period of up to 28 days, patients receive up to twelve 56-day treatment cycles for a total of up to 96 weeks of treatment, followed by a 24 week follow-up period. Efficacy, safety, PK, ADA, and exploratory biomarker analysis are performed.

Efficacy Procedures

MRI: An MRI for tumor assessment is performed 72 hrs post-surgery, at the screening visit (within 28 days prior to infusion), on day 56±3 of every cycle (approximately every 8 weeks), and when PD is suspected. Patients for whom disease has not progressed have additional tumor assessments performed at follow-up visits 3, 5, and 7. Note: if PD has been confirmed, additional scans will not be required during follow-up visits. If pre and post-surgery MRIs were performed prior to enrollment onto the study, those scans must also be submitted to the study to aid in determination of tumor volume and tumor progression.

Tumor response evaluation is performed according to iRANO; and clinical neurologic assessment will be performed by NANO. Assessments according to RANO are also performed as a supportive exploration; however, the primary determination of disease progression for an individual patient is made according to iRANO.

The European Organization for Research and Treatment of Cancer Quality of Life Questionnaire (EORTC QLQ-C30) and the EORTC Brain Cancer Module (EORTC QLQ-BN20) Questionnaire: The EORTC QLQ-C30 is a 30-item questionnaire that assesses health-related quality of life (HRQoL) in cancer patients with 15 scales (single- or multi-item), each with possible scores ranging from 0 to 100. Of the 30 items, 24 aggregate into 9 multi-item scales representing various HRQoL dimensions: 5 functioning scales (physical, role, emotional, cognitive, and social), 3 symptom scales (fatigue, pain, and nausea), and 1 global measure of health status. The remaining 6 single-item scales assess symptoms: dyspnea, appetite loss, sleep disturbance, constipation and diarrhea, and the perceived financial impact of the disease treatment. High scores indicate better HRQoL for the global measure of health status and functioning scales, and worse HRQoL for the symptom scales.

The EORTC QLQ-BN20 is a 20-item QoL assessment specific to brain neoplasms and is intended to supplement the EORTC QLQ-C30 when assessing health-related quality of life. The EORTC QLQ-BN20 questionnaire assesses disease symptoms, side-effects of treatment, and some specific psychosocial issues of importance to patients with brain cancer using 4 scales (assessing future uncertainty, visual disorder, motor dysfunction, and communication deficit) and 7 single items (assessing other disease symtpoms [eg, headaches and seizures] and treatment toxic effects [e.g., hair loss]). The possible scores range from 0 to 100; high scores indicate worse HRQoL.

Mini-Mental Status Assessment: The Mini-Mental State Examination (MMSE©) is a brief, quantitative measure of cognitive status in adults. It can be used to screen for cognitive impairment, to estimate the severity of cognitive impairment at a given point in time, and to follow the course of cognitive changes in an individual over time. In this study, the MMSE score is part of the neurological examination performed in the context of the disease assessments.

MMSE is performed at day 1/baseline, at the end of every treatment cycle, and every 8 weeks during the follow-up period. The MMSE assessments coincide with the schedule of disease assessments, but they must be completed prior to announcing the radiological assessment result to the patient. The MMSE may be completed at the beginning of the next scheduled treatment administration. During survival follow-up period, the MMSE should continue to be completed at every second survival visit (every 8 weeks) if the patient has not yet progressed.

The total score of the MMSE has a possible range from 0 (worst) to 30 (best).

Safety Procedures

At cycle 1 day 1 and on all subsequent treatment days, vital signs, including temperature, resting blood pressure, pulse, and respiration, along with weight will be collected prior to infusion, and approximately 15 minutes after the completion of the infusion. A complete physical examination and a 12-lead ECG is carried out at the beginning of every cycle.

Exploratory Tumor Biomarker Procedures

The biomarkers of interest that are analyzed by immunohistochemistry (IHC) include but are not limited to EGFRvIII and biomarkers of cell proliferation (for example, Ki67). Expression levels (mRNA and/or protein) of PD-L1, GITR, and LAG-3, as well as lineage markers of tumor infiltrating lymphocytes (CD4, CD8, CD25, FoxP3) are analyzed in tumor biopsy samples to explore potential effect of REGN2810.

Tumor tissue samples may be used for extraction of tumor DNA and RNA and subsequent analyses of putative genetic biomarkers relevant to study treatment and glioblastoma. A blood sample is collected for isolation of germ-line DNA on day 1/baseline (predose), or at any study visit, if collection at day 1/baseline is not possible. Analyses of the tumor DNA include (but are not limited to) methylation status of MGMT promoter, IDH1 mutational status, microsatelite instabilty (MSI), and tumor mutation burden (which both may be predictive of response to REGN2810 and other immunotherapeutic agents). Analysis of genetic variants in tumor (somatic) DNA and germ-line DNA that may affect disease progression, drug response and possible toxicities are performed. Germ-line DNA is also used for comparison to tumor DNA to explore potential novel genetic variants underlying malignant processes.

Results

REGN2810 in combination with hfRT is safe and well-tolerated by patients with nGBM. Administration of REGN2810 in combination with hfRT inhibits tumor growth and/or promotes tumor regression in patients with nGBM as compared to standard of care therapy. Patients with nGBM treated with REGN2810 and hfRT show a longer OS as compared to standard of care therapy.

Example 11: Tolerability and Anti-Tumor Activity of REGN2810 in Patients with Non-Small Cell Lung Cancer: Interim Data from Phase 1

In the dose escalation (DE) study in phase 1 (described in Example 7 herein), REGN2810 (cemiplimab) monotherapy was evaluated at 1 mg/kg intravenously (IV) over 30 minutes every 2 weeks (Q2W) for non-small cell lung cancer (NSCLC). The NSCLC expansion cohort (EC 1) enrolled patients who have relapsed after, or were refractory to at least first-line therapy in the recurrent or metastatic disease setting; patients received cemiplimab 200 mg IV over 30 minutes Q2W for up to 48 weeks. Research biopsies were performed at baseline and Day 29 (and at progression, if possible). Tumor measurements were performed every 8 weeks according to RECIST (Response Evaluation Criteria In Solid Tumors) 1.1.

Interim Results: 21 patients with NSCLC (1 in DE; 20 in EC 1) were enrolled; median age was 65.0 years (range, 50-82; 14 M/7 F); 81.0% had a median Eastern Cooperative Oncology Group performance status of 1. The majority (61.9%) had a histology of adenocarcinoma at baseline. Overall, the most common treatment-related adverse events (TRAEs) were asthenia, pneumonitis, and rash (each n=3, 14.3%). Each of the following ≥Grade 3 TRAEs occurred once: pneumonitis, diabetic ketoacidosis, and nephritis. Of the patients in EC 1, 6 had partial response (PR) and 4 had stable disease (SD). Overall response rate (ORR=complete response [CR]+PR), per central independent review (data transfer: Aug. 31, 2017) was 28.6% (n=6/21). Disease control rate (ORR+SD) was 57.1% (n=12/21; of which 1 was a non-CR/non-progressive disease [PD]). Overall, 9 patients (all from EC 1) had PD during treatment with cemiplimab.

Cemiplimab has been generally well tolerated and shown antitumor activity in NSCLC patients from this study.

Example 12: Clinical Trial of REGN2810 in First-Line Treatment of Patients with Advanced or Metastatic PD-L1+ Non-Small Cell Lung Cancer

The current study is a randomized, global, open-label, phase 3 study of REGN2810 monotherapy versus standard-of-care, platinum-based, doublet chemotherapies in patients with advanced or metastatic, squamous or non-squamous NSCLC whose tumors express PD-L1 in ≥50% of tumor cells and who have received no prior systemic treatment for their advanced disease.

Study Objectives

The main objective of the study is to determine if REGN2810 improves progression-free survival (PFS) over standard-of-care platinum doublet chemotherapy in patients with advanced or metastatic, squamous or non-squamous NSCLC whose tumors express PD-L1 in ≥50% of tumor cells. The key secondary objectives of the study are to compare REGN2810 versus platinum based chemotherapies with respect to:

-   -   Overall survival (OS)     -   Objective response rates (ORR)

The other secondary objectives of the study are the following:

-   -   To compare the duration of response (DOR) of REGN2810 versus         platinum based chemotherapies     -   To assess quality of life (QOL) of patients treated with         REGN2810 versus patients receiving platinum-based chemotherapies         as measured by the European Organization for Research and         Treatment of Cancer Quality of Life Questionnaire Core 30 (EORTC         QLQ-C30) and Quality of Life Questionnaire Lung Cancer 13 (EORTC         QLQ-LC13).     -   To evaluate the safety and tolerability of REGN2810 versus         platinum-based chemotherapies     -   To measure concentrations of REGN2810 in serum and characterize         the pharmacokinetics (PK) of REGN2810

The exploratory objectives include:

-   -   To assess immunogenicity as measured by immunogenicity         assessment to REGN2810     -   To assess correlation between the level of PD-L1 expression at         baseline and efficacy of study treatment     -   To assess time to new anti-tumor therapy

Study Design

This is a randomized, multicenter, open-label, pivotal phase 3 study of REGN2810 monotherapy versus platinum-based doublet chemotherapy in patients with stage IIIB or stage IV squamous or non-squamous NSCLC whose tumors express PD-L1 in ≥50% of tumor cells and who have received no prior systemic treatment for their advanced disease.

The study consists of the following 3 periods: screening, treatment, and follow-up. Patients undergo a screening evaluation to determine their eligibility within 28 days prior to randomization. Eligible patients are randomized to one of the following 2 treatment groups: REGN2810 350 mg monotherapy or standard-of-care chemotherapy. Randomization is stratified by histology (non-squamous versus squamous) and geographic region (EU or ROW). Patients with NSCLC randomized to chemotherapy may receive one of the following regimens:

-   -   Paclitaxel+cisplatin or carboplatin     -   Gemcitabine+cisplatin or carboplatin     -   Pemetrexed+cisplatin or carboplatin followed by optional         pemetrexed maintenance (it is recommended that patients with         squamous NSCLC not be given pemetrexed-containing regimens)

Patients assigned to the REGN2810 treatment group receive REGN2810 350 mg as an intravenous (IV) infusion on day 1 of every treatment cycle (every 3 weeks [Q3W]) for up to 108 weeks or until Response Evaluation Criteria in Solid Tumors (RECIST) 1.1-defined progressive disease, unacceptable toxicity, death, or withdrawal of consent. REGN2810 patients who experience RECIST 1.1-defined progressive disease on therapy may continue treatment with REGN2810 if the patient is determined to be experiencing clinical benefit and if the patient has not completed the 108-week treatment period. If further progressive disease (defined as an additional 10% increase in tumor burden from the time of initial progressive disease) is confirmed, REGN2810 must be discontinued and other anticancer therapy considered, if appropriate.

Patients assigned to chemotherapy receive one of the protocol-given options of platinum-doublet chemotherapy treatment for up to 4 to 6 cycles or until RECIST 1.1-defined progressive disease, unacceptable toxicity, death, or withdrawal of consent. Patients who experience disease progression while on chemotherapy are offered the option to crossover to receive REGN2810 350 mg Q3W for up to 108 weeks, provided they meet specific criteria. Patients have follow-up visits every 6 weeks for 6 months and then at 9 months and 12 months after the last dose of treatment. The duration of the study for each patient is approximately 40 months.

Study Population

Patients included in this study are men and women ≥18 years of age, diagnosed with stage IIIB or stage IV non-squamous or squamous NSCLC whose tumors express PD-L1 in ≥50% of tumor cells (using a diagnostic assay) and who have received no prior systemic treatment for their advanced disease.

Inclusion Criteria: A patient must meet the following criteria to be eligible for inclusion in the study:

-   -   1. Men and women ≥18 years of age     -   2. Patients with histologically or cytologically documented         squamous or non-squamous NSCLC with stage IIIB or stage IV         disease who received no prior systemic treatment for recurrent         or metastatic NSCLC a. Patients who received adjuvant or         neoadjuvant platinum-doublet chemotherapy (after surgery and/or         radiation therapy) and developed recurrent or metastatic disease         more than 6 months after completing therapy are eligible     -   3. Archival or newly obtained formalin-fixed tumor tissue from a         metastatic/recurrent site, which has not previously been         irradiated     -   4. Tumor cells expressing PD-L1 in ≥50% of tumor cells by IHC     -   5. At least 1 radiographically measureable lesion by computed         tomography (CT) or magnetic resonance imaging (MRI) per RECIST         1.1 criteria. Target lesions may be located in a previously         irradiated field if there is documented (radiographic) disease         progression in that site.     -   6. ECOG performance status of ≤1     -   7. Anticipated life expectancy of at least 3 months     -   8. Adequate organ and bone marrow function as defined below: a.         Hemoglobin ≥9.0 g/dL b. Absolute neutrophil count ≥1.5×109/L c.         Platelet count ≥100,000/mm3 d. Glomerular filtration rate         (GFR) >30 mL/min/1.73 m2 e. Total bilirubin ≤1.5×upper limit of         normal (ULN) (if liver metastases ≤3×ULN), with the exception of         patients diagnosed with clinically confirmed Gilbert's         syndrome f. Aspartate aminotransferase (AST) and alanine         aminotransferase (ALT)≤3×ULN or ≤5×ULN, if liver metastases g.         Alkaline phosphatase ≤2.5×ULN (or ≤5.0×ULN, if liver or bone         metastases) h. Not meeting criteria for Hy's law (ALT>3×ULN and         bilirubin >2×ULN)     -   9. Willing and able to comply with clinic visits and         study-related procedures     -   10. Provide signed informed consent     -   11. Able to understand and complete study-related         questionnaires.

Exclusion Criteria: A patient who meets any of the following criteria will be excluded from the study: 1. Patients that have never smoked, defined as smoking ≤100 cigarettes in a lifetime 2. Active or untreated brain metastases or spinal cord compression. Patients are eligible if central nervous system (CNS) metastases are adequately treated and patients have neurologically returned to baseline (except for residual signs or symptoms related to the CNS treatment) for at least 2 weeks prior to enrollment. Patients must be off (immunosuppressive doses of) corticosteroid therapy. 3. Patients with tumors tested positive for EGFR gene mutations, ALK gene translocations, or ROS1 fusions 4. Encephalitis, meningitis, or uncontrolled seizures in the year prior to informed consent 5. History of interstitial lung disease (e.g., idiopathic pulmonary fibrosis, organizing pneumonia) or active, noninfectious pneumonitis that required immune-suppressive doses of glucocorticoids to assist with management. A history of radiation pneumonitis in the radiation field is permitted. 6. Patients with active, known, or suspected autoimmune disease that has required systemic therapy in the past 2 years. Patients with vitiligo, type I diabetes mellitus, and hypothyroidism (including hypothyroidism due to autoimmune thyroiditis) only requiring hormone replacement are permitted to enroll. 7. Patients with a condition requiring corticosteroid therapy (>10 mg prednisone/day or equivalent) within 14 days of randomization. Physiologic replacement doses are allowed even if they are >10 mg of prednisone/day or equivalent, as long as they are not being administered for immunosuppressive intent. Inhaled or topical steroids are permitted, provided that they are not for treatment of an autoimmune disorder. 8. Another malignancy that is progressing or requires treatment, with the exception of nonmelanomatous skin cancer that has undergone potentially curative therapy, or in situ cervical carcinoma or any other tumor that has been treated, and the patient is deemed to be in complete remission for at least 2 years prior to study entry, and no additional therapy is required during the study period. 9. Known active hepatitis B (positive result) or hepatitis C (known positive result) and known quantitative HCV RNA results greater than the lower limits of detection of the assay) 10. Known history of human immunodeficiency virus (HIV) or known acquired immunodeficiency syndrome indicating uncontrolled active infection. Patients on highly active antiretroviral therapy with undetectable RNA levels and CD4 counts above 350 are permitted. 11. Active infection requiring systemic therapy within 14 days prior to randomization 12. Prior therapy with anti-PD-1 or anti-PD-L1. Prior exposure to other immunomodulatory or vaccine therapy such as anti-cytotoxic T-lymphocyte-associated antigen 4 (CTLA-4) antibodies is permitted, but the last dose of such an antibody should have been at least 3 months prior to the first dose of study drug. 13. Treatment-related immune-mediated adverse events (AEs) from immune-modulatory agents (including but not limited to anti-PD1/PD-L1 Mabs, anti-CTLA4 monoclonal antibodies, and PI3K-δ inhibitors) that have not resolved to baseline at least 3 months prior to initiation of treatment with study therapy. Patients are excluded from treatment with REGN2810 if they experienced immune-mediated AEs related to prior treatment with a blocker of the PD-1/PD-L1 pathway that were grade 3 or 4 in severity and/or required discontinuation of the agent, regardless of time of occurrence. 14. Receipt of an investigational drug or device within 30 days of screening or within 5 half-lives of the investigational drug or therapy being studied (whichever is longer) 15. Receipt of a live vaccine within 30 days of planned start of study medication 16. Major surgery or significant traumatic injury within 4 weeks prior to first dose 17. Documented allergic or acute hypersensitivity reaction attributed to antibody treatments 18. Known allergy to doxycycline or other tetracycline antibiotics 19. Known psychiatric or substance abuse disorder that would interfere with participation with the requirements of the study, including current use of any illicit drugs 20. Pregnant or breastfeeding women. 21. Women of childbearing potential who are unwilling to practice highly effective contraception prior to the initial dose, during the study, and for at least 6 months after the last dose. 22. Patients who are committed to an institution by virtue of an order issued either by the judicial or the administrative authorities will be excluded from this study.

Study Treatments

Study Drug: REGN281p is administered at 350 mg as an IV infusion Q3W for up to 108 weeks.

Reference Drug: Standard-of-care chemotherapy (one of the protocol given options of platinum-doublet chemotherapy treatment, Table 13) is administered for up to 4 to 6 cycles or until RECIST 1.1-defined progressive disease, unacceptable toxicity, death, or withdrawal of consent.

TABLE 13 Guidelines for Platinum-based Doublet Chemotherapy Regimens Option Chemotherapy Regimen Dosing Frequency Maintenance Therapy 1 Pemetrexed 500 mg/m2 plus Day 1 every 21 days for Optional pemetrexed cisplatin 75 mg/m2 IV 4-6 cycles 500 mg/m2 IV day 1 every 21 days 2 Pemetrexed 500 mg/m2 IV plus Day 1 every 21 days for Optional pemetrexed carboplatin AUC of 5-6 4-6 cycles 500 mg/m2 IV day 1 mg/mL/minute IV every 21 days 3 Paclitaxel 200 mg/m2 IV plus Day 1 every 21 days for N/A cisplatin 75 mg/m2 IV 4-6 cycles 4 Paclitaxel 200 mg/m2 IV plus Day 1 every 21 days for N/A carboplatin AUC of 5-6 4-6 cycles mg/mL/minute IV 5 Gemcitabine 1250 mg/m2 IV plus Day 1 and day 8 N/A cisplatin 100 mg/m2 IV (gemcitabine only) every 21 days for 4-6 cycles 6 Gemcitabine 1250 mg/m2 IV plus Day 1 and day 8 N/A carboplatin AUC of 5-6 (gemcitabine only) every mg/mL/minute IV 21 days for 4-6 cycles

Study Endpoints

The primary endpoint is PFS as assessed using RECIST 1.1. The key secondary endpoints in the study are OS and ORR. Other secondary endpoints include DOR and QOL, as well as the safety and tolerability of REGN2810.

Procedures and Assessments

Procedures performed at screening include informed consent; recording of medical, oncology, and concomitant medications histories; recording of demographics; collection of tumor tissue for PD-L1 assessment; testing of tumor tissue for epidermal growth factor receptor (EGFR) and anaplastic lymphoma kinase (ALK) mutations and human homolog of the transforming gene v-ros of the avian sarcoma virus UR2 (ROS1) fusions; radiographic tumor assessment; tumor burden assessment; chest X-ray; serum pregnancy testing; 12-lead electrocardiogram (ECG); complete physical examination, including vital signs, height, and weight assessments; Eastern Cooperative Oncology Group (ECOG) performance status assessment; and laboratory testing. Samples for an optional genomic sub-study may also be obtained. During the treatment and follow-up periods, the following procedures are performed to assess safety: physical examination; ECOG performance status assessment; vital signs; laboratory testing, including pregnancy testing for women of childbearing potential; ECG and chest X-ray (at the discretion of the investigator); and recording of adverse events (AEs) and concomitant medications. Computed tomography (CT) or magnetic resonance imaging (MRI) for tumor assessment is performed at time points throughout the study. Quality of life is measured using validated patient self-administered questionnaires (EORTC QLQ-C30 and EORTC QLQ-LC13). Other assessments include samples for biomarker assessments, samples for REGN2810 concentration measurement, and samples for REGN2810 immunogenicity assessment.

Results

It is expected that REGN2810 treatment leads to increased progression-free survival and overall survival as compared to treatment with chemotherapy in patients with advanced non-small cell lung cancer whose tumors express ≥50% PD-L1 in tumor tissue.

Example 13: Combination of Standard and High-Dose REGN2810 (Cemiplimab) and Ipilimumab (Anti-CTLA-4 Antibody) in the Second-Line Treatment of Patients with Metastatic Non-Small Cell Lung Cancer with Tumors Expressing PD-L1<50%

This Example describes a clinical study of combinations of standard and high dose REGN2810 (cemiplimab; anti-PD-1 antibody) and ipilimumab (anti-CTLA-4 antibody) in the second-line treatment of patients with metastatic non-small cell lung cancer with tumors expressing PD-L1<50%.

The primary objective of the study is to compare the objective response rate (ORR) of high dose REGN2810 (“HDREGN2810”) and standard dose REGN2810 (“SDREGN2810/ipi”) plus ipilimumab combination therapy versus standard dose REGN2810 (“SDREGN2810”) in the second-line treatment of patients with advanced or metastatic squamous or non-squamous non-small cell lung cancer (NSCLC), in patients whose tumors express programmed cell death ligand 1 (PD-L1) in <50% of tumor cells.

The secondary objectives of the study are the following: (1) To compare the overall survival (OS) of SDREGN2810, HDREGN2810, and SDREGN2810/ipi combination therapy in the second-line treatment of patients with advanced squamous or non-squamous NSCLC in patients whose tumors express PD-L1 in <50% of tumor cells. (2) To compare the progression-free survival (PFS) of HDREGN2810 and SDREGN2810/ipi versus SDREGN2810 in the second-line treatment of patients with advanced squamous or non-squamous NSCLC in patients whose tumors express PD-L1 in <50% of tumor cells. (3) To evaluate the safety and tolerability of HDREGN2810 and SDREGN2810/ipi compared to SDREGN2810 therapy (4) To evaluate the OS at 12 and 18 months of HDREGN2810 and SDREGN2810/ipi versus SDREGN2810 therapy in the second-line treatment of patients with advanced squamous or non-squamous NSCLC in patients whose tumors express PD-L1 in <50% of tumor cells (5) To evaluate quality of life (QOL) in patients with advanced squamous or non-squamous NSCLC receiving HDREGN2810 and SDREGN2810/ipi versus SDREGN2810 therapy (6) To assess immunogenicity as measured by anti-drug antibodies (ADAs) against REGN2810 (7) To characterize the pharmacokinetics (PK) of REGN2810 when administered in combination with ipilimumab or as HDREGN2810.

Study Design

This is a clinical study of HDREGN2810 and SDREGN2810/ipi versus SDREGN2810 therapy in the second-line treatment of patients with advanced or metastatic squamous or non-squamous NSCLC with tumors expressing PD-L1<50%. The study will consist of the following 3 periods: screening, treatment, and follow-up. Patients will undergo a screening evaluation to determine their eligibility within 28 days prior to randomization. Eligible patients will be randomized 1:1:1 to receive one of the following treatment regimens:

-   -   Treatment Arm A: REGN2810 350 mg every 3 weeks (Q3W) for 108         weeks (referred to as “SDREGN2810” hereinafter)     -   Treatment Arm B: REGN2810 350 mg Q3W for 108 weeks plus         ipilimumab 50 mg every 6 weeks (Q6W) for up to 4 doses (referred         to as “SDREGN2810/ipi” hereinafter)     -   Treatment Arm C: REGN2810 1050 mg Q3W for 108 weeks (referred to         as “HDREGN2810” hereinafter)

At randomization, patients will be stratified by histology (squamous versus non-squamous) and PD-L1 expression level (<1% versus 1% to <50%). Patients will receive their assigned treatment for the treatment period (as noted above). Treatment may be discontinued early due to Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1)-defined progressive disease, unacceptable toxicity, withdrawal of consent, death, initiation of another anti-cancer treatment, or in specific instances of confirmed complete response (CR), partial response (PR) or stable disease (SD). Patients who experience RECIST 1.1-defined progressive disease on therapy may continue study treatment if the investigator judges the patient to be experiencing clinical benefit and if the patient has not completed the 108-week treatment period. If further progressive disease (defined as an additional 10% increase in tumor burden from the time of initial progressive disease) is confirmed, REGN2810 (and ipilimumab, if applicable) must be discontinued and other anti-cancer therapy considered, if appropriate. After discontinuing study treatment, patients will enter the follow-up period. Each patient will have the first follow-up visit 14 to 30 days (±7 days) after the last study treatment, if treatment is discontinued early due to progressive disease, toxicity, or for another reason. Otherwise, each patient will have the first follow-up visit 14 to 30 days (±7 days) after the last cycle visit. Follow-up visit 2 through follow-up visit 7 will occur 28 days (±7 days) from the previous visit. Survival data will then be collected by phone or at an office visit every 3 months until death, loss to follow-up, or withdrawal of study consent.

Study Population

Patients in this study will include men and women ≥18 years of age, diagnosed with advanced or metastatic non-squamous or squamous NSCLC who received only 1 prior line of treatment for advanced or metastatic NSCLC and whose tumors express PD-L1<50%.

Inclusion Criteria: 1. Men and women ≥18 years of age; 2. Patients with histologically or cytologically documented squamous or non-squamous NSCLC with stage IIb disease who are not candidates for treatment with definitive concurrent chemo-radiation or patients with stage IV disease if they have received prior systemic treatment for advanced or metastatic NSCLC and who have received 1 prior line of treatment for advanced NSCLC; 3. Availability of an archival or on-study obtained formalin-fixed, paraffin-embedded tumor tissue biopsy sample. Guidance on biopsy sites: a. Archival or fresh biopsies are acceptable; b. If an archival biopsy is used, it has to be less than 5 months old; c. The biopsy should be from a metastatic or recurrent site which has not previously been irradiated. Exception: the primary tumor is still in place and the other metastatic sites are either not accessible (brain) or cannot be used (bone) or the biopsy would put the patient at risk. 4. Expression of PD-L1 in <50% of tumor cells determined by the PD-L1 IHC 22C3 pharmDx assay performed by the central laboratory; 5. At least 1 radiographically measureable lesion by computed tomography (CT) per RECIST 1.1 criteria. Target lesions may be located in a previously irradiated field if there is documented (radiographic) disease progression in that site. 6. ECOG performance status of ≤1; 7. Anticipated life expectancy of at least 3 months.

Exclusion Criteria: 1. Patients who have never smoked, defined as smoking ≤100 cigarettes in a lifetime; 2. Active or untreated brain metastases or spinal cord compression. Patients are eligible if central nervous system (CNS) metastases are adequately treated and patients have neurologically returned to baseline (except for residual signs or symptoms related to the CNS treatment) for at least 2 weeks prior to enrollment. Patients must be off (immunosuppressive doses of) corticosteroid therapy (see exclusion criteria 7) for details on timing of discontinuation of steroids) 3. Patients with tumors tested positive for EGFR gene mutations, ALK gene translocations, or ROS1 fusions. All patients will have their tumor evaluated for EGFR mutations, ALK rearrangement, and ROS1 fusions 4. Encephalitis, meningitis, or uncontrolled seizures in the year prior to informed consent. 5. History of interstitial lung disease (eg, idiopathic pulmonary fibrosis or organizing pneumonia), or active, noninfectious pneumonitis that required immune-suppressive doses of glucocorticoids to assist with management, or of pneumonitis within the last 5 years. A history of radiation pneumonitis in the radiation field is permitted as long as pneumonitis resolved ≥6 months prior to enrollment. 6. Ongoing or recent evidence of significant autoimmune disease that required treatment with systemic immunosuppressive treatments, which may suggest a risk of immune-related treatment emergent adverse events (irTEAEs). The following are not exclusionary: vitiligo, childhood asthma that has resolved, residual hypothyroidism that required only hormone replacement, or psoriasis that does not require systemic treatment 7. Patients with a condition requiring corticosteroid therapy (>10 mg prednisone/day or equivalent) within 14 days of randomization. Physiologic replacement doses are allowed even if they are >10 mg of prednisone/day or equivalent, as long as they are not being administered for immunosuppressive intent. Inhaled or topical steroids are permitted, provided that they are not for treatment of an autoimmune disorder.

Study Treatments

-   -   REGN2810 administered at 350 mg as an intravenous (IV) infusion         Q3W for 108 weeks (“SDREGN2810”)     -   REGN2810 administered at 350 mg as an IV infusion Q3W for 108         weeks in combination with ipilimumab administered IV at 50 mg         Q6W for up to 4 doses (“SDREGN2810/ipi”)     -   REGN2810 administered at 1050 mg as an IV infusion Q3W for 108         weeks (“HDREGN2810”)

Study Endpoints

The primary endpoint is ORR as defined as the proportion of patients who achieved CR or PR based on RECIST 1.1 as assessed by a blinded Independent Review Committee (IRC).

The secondary endpoints in the study are: (1) Overall survival (OS) defined as the time from randomization to the date of death. A patient who has not died will be censored at the last known date of that patient being alive. (2) Progression-free survival (PFS) defined as the time from randomization to the date of the first documented tumor progression as determined by RECIST 1.1 as assessed by the blinded IRC, or death due to any cause. (3) Overall survival at 12 months, 18 months, and end of treatment (4) Safety and tolerability of SDREGN2810, HDREGN2810 and SDREGN2810/ipi combination therapy measured by the incidence of treatment-emergent adverse events, dose-limiting toxicities, serious adverse events, deaths, and laboratory abnormalities (5) Quality of life as measured by the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire Core 30 (EORTC QLQ-C30) and Quality of Life Questionnaire Lung Cancer 13 (EORTC QLQ-LC13) (6) Characterization of the PK of REGN2810 when administered in combination with ipilimumab or as HDREGN2810. (7) Assessment of immunogenicity as measured by ADA titers against REGN2810. (8) Assessment of hair pigmentation by the investigator (9) Tumor mutation burden as assessed by the Foundation Medicine “FoundationOne®” panel (10) Assessment of tumor volume (11) ICOS+CD4 T-cell frequency and other markers of T-cell activation

Procedures and Assessments

Procedures to be performed at screening will include informed consent; assessment of inclusion/exclusion criteria; recording of medical, oncology, and concomitant medications histories; recording of demographics; collection and testing of tumor tissue samples for PD-L1 assessment and for epidermal growth factor receptor (EGFR) and anaplastic lymphoma kinase (ALK) mutations and C-ros oncogene receptor tyrosine kinase (ROS1) fusions; radiographic tumor assessment; tumor burden assessment; chest X-ray; serum pregnancy testing; 12-lead electrocardiogram; adverse event (AE) recording; physical examination, including vital signs, height, and weight assessments; Eastern Cooperative Oncology Group (ECOG) performance status assessment; and laboratory testing. Samples for an optional genomic sub-study may also be obtained. During the treatment period, the following procedures will be performed to assess efficacy and safety: QOL measurement using validated patient questionnaires; physical examination; ECOG performance status assessment; vital signs; laboratory testing, including pregnancy testing for women of childbearing potential; recording of AEs and concomitant medications. Computed tomography for radiographic tumor burden assessment and tumor burden assessment based on RECIST 1.1 criteria will be performed at prespecified time points throughout the study. Other assessments will include investigator assessments of hair repigmentation, REGN2810 concentration measurement, REGN2810 ADA assessment, and biomarker assessments. Biomarker procedures will include the use of tumor tissue samples for validation of additional PD-L1 assays. Survival data will then be collected by phone or at an office visit every 3 months until death, loss to follow-up, or withdrawal of study consent.

Results

It is expected that SDREGN2810/ipi or HDREGN2810 will have a higher response rate than SDREGN2810 in patients whose tumors express PD-L1 in <50% of tumor cells. Assuming a 10% overall response rate in patients with PD-L1 expression of 1% to <50% treated with SDREGN2810, it is expected that HDREGN2810 or SDREGN2810/ipi could achieve an ORR of 30%; an absolute increase of 20% compared with SDREGN2810.

Example 14: Clinical Study of Combinations of REGN2810 (Anti-Pd-1 Antibody), Ipilimumab (Anti-CTLA4 Antibody) and Platinum Doublet Chemotherapy in the First Line Treatment of Patients with Advanced or Metastatic Non-Small Cell Lung Cancer Whose Tumors Express PD-L1<50%

This Example describes a clinical study of combinations of REGN2810 (anti-PD-1 antibody), ipilimumab (anti-CTLA-4 antibody), and platinum-based doublet chemotherapy in first-line treatment of patients with advanced or metastatic non-small cell lung cancer with tumors expressing PD-L1<50% and who have received no prior systemic treatment for their advanced disease.

The primary objective of the study is to compare the progression-free survival (PFS) of REGN2810 plus 4 to 6 cycles of standard-of-care platinum-based doublet chemotherapy combination therapy (REGN2810/chemo-f) and REGN2810 plus 2 cycles only of standard-of-care platinum-based doublet chemotherapy plus ipilimumab combination therapy (REGN2810/chemo-l/ipi) with standard-of-care platinum-based doublet chemotherapy in the first-line treatment of patients with advanced squamous or non-squamous non-small cell lung cancer (NSCLC) in the subgroup of patients whose tumors express programmed cell death ligand 1 (PD-L1) in 1% to <50% of tumor cells and in the overall population of study patients whose tumors express PD-L1 in <50% of tumor cells.

The secondary objectives include: (1) To compare the overall survival (OS) of REGN2810/chemo-f and REGN2810/chemo-l/ipi versus standard-of-care platinum-based doublet chemotherapy in the first-line treatment of patients with advanced squamous or non-squamous NSCLC in the subgroup of patients whose tumors express PD-L1 in 1% to <50% of tumor cells and in the overall population of study patients whose tumors express PD-L1 in <50% of tumor cells. (2) To compare the objective response rate (ORR) of REGN2810/chemo-f and REGN2810/chemo-l/ipi versus standard-of-care platinum-based doublet chemotherapy in the first-line treatment of patients with advanced squamous or non-squamous NSCLC in the subgroup of patients whose tumors express PD-L1 in 1% to <50% of tumor cells and in the overall population of study patients whose tumors express PD-L1 in <50% of tumor cells. (3) To evaluate the safety and tolerability of REGN2810 plus 4-6 cycles of platinum doublet chemotherapy and REGN2810 plus Ipilimumab. (4) To characterize the pharmacokinetics of REGN2810 plus 4-6 cycles of platinum doublet chemotherapy and REGN2810 plus Ipilimumab. (5) To compare the OS at 12 and 18 months of REGN2810/chemo-f or REGN2810/chemo-l/ipi versus standard-of-care platinum-based doublet chemotherapy in the first-line treatment of patients with advanced squamous or non-squamous NSCLC in the subgroup of patients whose tumors express PD-L1 in 1% to <50% of tumor cells and in the overall population of study patients whose tumors express PD-L1 in <50% of tumor cells. (6) To assess immunogenicity as measured by anti-drug antibodies for REGN2810.

Study Population

The target population includes men and women ≥18 years of age with <50% PD-L1+ tumor cells, Stage IIIB or Stage IV, squamous or non-squamous NSCLC with no previous treatment for their advanced disease.

Inclusion Criteria:

1) Men and women ≥18 years of age 2) Patients with histologically or cytologically documented squamous or non-squamous NSCLC with stage IIIB or stage IV disease who received no prior systemic treatment for recurrent or metastatic NSCLC 3) Patients who received adjuvant or neoadjuvant platinum-doublet chemotherapy (after surgery and/or radiation therapy) and developed recurrent or metastatic disease more than 6 months after completing therapy are eligible 4) Patients who received adjuvant or neoadjuvant PD-1 or PD-L1 blockade and developed recurrent or metastatic disease more than 12 months after completing therapy are eligible 5) Archival or newly obtained formalin-fixed tumor tissue from a metastatic/recurrent site, which has not previously been irradiated 6) Tumor cells expressing PD-L1 in <50% of tumor cells by IHC performed by the central laboratory 7) At least 1 radiographically measureable lesion by computed tomography (CT) or magnetic resonance imaging (MRI) per RECIST 1.1 criteria. Target lesions may be located in a previously irradiated field if there is documented (radiographic) disease progression in that site. 8) ECOG performance status of ≤1 9) Anticipated life expectancy of at least 3 months 10) Adequate organ and bone marrow function as defined below: 11) Hemoglobin ≥10.0 g/dL 12) Absolute neutrophil count ≥1.5×10⁹/L 13) Platelet count ≥100,000/mm³ 14) Glomerular filtration rate (GFR) >30 mL/min/1.73 m² 15) Total bilirubin ≤1.5×upper limit of normal (ULN) (if liver metastases ≤3×ULN), with the exception of patients diagnosed with clinically confirmed Gilbert's syndrome 16) Aspartate aminotransferase (AST) and alanine aminotransferase (ALT)≤3×ULN or ≤5×ULN, if liver metastases 17) Alkaline phosphatase ≤2.5×ULN (or ≤5.0×ULN, if liver or bone metastases) 18) Not meeting criteria for Hy's law (ALT>3×ULN and bilirubin >2×ULN) 19) Willing and able to comply with clinic visits and study-related procedures 20) Provide signed informed consent 21) Able to understand and complete study-related questionnaires

Exclusion Criteria: 1. Patients who have never smoked, defined as smoking ≤100 cigarettes in a lifetime; 2. Active or untreated brain metastases or spinal cord compression. Patients are eligible if central nervous system (CNS) metastases are adequately treated and patients have neurologically returned to baseline (except for residual signs or symptoms related to the CNS treatment) for at least 2 weeks prior to enrollment. Patients must be off (immunosuppressive doses of) corticosteroid therapy (see exclusion criteria 7) for details on timing of discontinuation of steroids) 3. Patients with tumors tested positive for EGFR gene mutations, ALK gene translocations, or ROS1 fusions. All patients will have their tumor evaluated for EGFR mutations, ALK rearrangement, and ROS1 fusions 4. Encephalitis, meningitis, or uncontrolled seizures in the year prior to informed consent. 5. History of interstitial lung disease (eg, idiopathic pulmonary fibrosis or organizing pneumonia), or active, noninfectious pneumonitis that required immune-suppressive doses of glucocorticoids to assist with management, or of pneumonitis within the last 5 years. A history of radiation pneumonitis in the radiation field is permitted as long as pneumonitis resolved ≥6 months prior to enrollment. 6. Ongoing or recent evidence of significant autoimmune disease that required treatment with systemic immunosuppressive treatments, which may suggest a risk of immune-related treatment emergent adverse events (irTEAEs). The following are not exclusionary: vitiligo, childhood asthma that has resolved, residual hypothyroidism that required only hormone replacement, or psoriasis that does not require systemic treatment 7. Patients with a condition requiring corticosteroid therapy (>10 mg prednisone/day or equivalent) within 14 days of randomization. Physiologic replacement doses are allowed even if they are >10 mg of prednisone/day or equivalent, as long as they are not being administered for immunosuppressive intent. Inhaled or topical steroids are permitted, provided that they are not for treatment of an autoimmune disorder.

Study Design

This clinical trial is a study of REGN2810/chemo-f versus REGN2810/chemo-1/ipi versus standard-of-care platinum-based doublet chemotherapy in the first-line treatment of patients with stage IIIB or stage IV squamous or non-squamous NSCLC, whose tumors express PD-L1 in <50% of tumor cells and who have received no prior systemic treatment for their advanced disease. Tumor tissue (tumor block or at least 12 unstained slides) will be provided for PD-L1 assessment using a validated PD-L1 assay.

Patients with advanced treatment naïve NSCLC are randomized 1:1:1 to one of the following treatment arms:

Treatment Arm A: standard-of-care platinum-based doublet chemotherapy every 3 weeks (Q3W) for 4 to 6 cycles (followed by optional pemetrexed maintenance for those patients initially assigned to receive a pemetrexed-containing regimen)

Treatment Arm B: REGN2810 350 mg Q3W for 108 weeks plus standard-of-care platinum-based doublet chemotherapy for 4 to 6 cycles (referred to as “REGN2810/chemo-f” hereinafter)

Treatment Arm C: REGN2810 350 mg Q3W for 108 weeks plus standard-of-care platinum-based doublet chemotherapy for 2 cycles and ipilimumab 50 mg every 6 weeks (Q6W) for up to 4 doses (referred to as “REGN2810/chemo-l/ipi” hereinafter)

Randomization is stratified by histology (non-squamous versus squamous) and levels of PD-L1 expression (<1% versus 1% to 24% versus 25% to <50%).

Patients will receive their assigned treatment for the treatment period (as noted above). Treatment may be discontinued early due to Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1)-defined progressive disease, unacceptable toxicity, withdrawal of consent, death, initiation of another anti-cancer treatment, or, for patients in Treatment Arms B and C, in specific instances of confirmed complete response (CR) or partial response (PR).

Study Treatments

Treatment Arm (A): Standard-of-care platinum-based doublet chemotherapy administered IV Q3W for 4 to 6 cycles (followed by optional pemetrexed maintenance for those patients initially assigned to receive a pemetrexed-containing regimen)

Treatment Arm (B): REGN2810 administered at 350 mg as an intravenous (IV) infusion Q3W for 108 weeks in combination with standard-of-care platinum-based doublet chemotherapy Q3W administered IV for 4 to 6 cycles

Treatment Arm (C): REGN2810 administered at 350 mg as an IV infusion Q3W for 108 weeks in combination with standard-of-care platinum-based doublet chemotherapy Q3W administered IV for 2 cycles and ipilimumab administered IV over approximately 90 minutes at 50 mg Q6W for up to 4 doses

Standard of Care platinum doublet chemotherapy 4-6 cycles is administered according to the one of the following regimens:

(i) Paclitaxel+Cisplatin: Participants will receive paclitaxel 200 mg/m² administered IV followed by cisplatin 75 mg/m² administered IV on Day 1 every 21 days for 4-6 cycles or until documented disease progression. (ii) Paclitaxel+Carboplatin: Participants will receive paclitaxel 200 mg/m² administered IV followed by carboplatin AUC of 5 or 6 mg/ml/min administered IV on Day 1 every 21 days for 4-6 cycles or until documented disease progression. (iii) Gemcitabine+Cisplatin: Participants will receive gemcitabine 1250 mg/m² administered IV on days 1 and 8 of each 21-day cycle and cisplatin 75 mg/m² administered IV on Day 1 every 21 days for 4-6 cycles or until disease progression. (iv) Gemcitabine+Carboplatin: Participants will receive gemcitabine 1250 mg/m² administered IV on days 1 and 8 of each 21-day cycle and carboplatin AUC of 5 or 6 mg/ml/min administered IV on Day 1 every 21 days for 4-6 cycles or until disease progression. (v) Pemetrexed+Cisplatin (for non-squamous histology only): Participants will receive pemetrexed 500 mg/m² iv followed by cisplatin 75 mg/m² administered IV on Day 1 every 21 days for 4-6 cycles followed by optional pemetrexed 500 mg/m² maintenance for the remainder of the study or until documented disease progression. (vi) Pemetrexed+Carboplatin (for non-squamous histology only): Participants will receive pemetrexed 500 mg/m² administered IV followed by carboplatin AUC of 5 or 6 mg/ml/min administered IV on Day 1 every 21 days for 4-6 cycles followed by optional pemetrexed 500 mg/m² maintenance for the remainder of the study or until documented disease progression.

Procedures and Assessments

Procedures to be performed at screening include informed consent; assessment of inclusion/exclusion criteria; recording of medical, oncology, and concomitant medications histories; recording of demographics; collection and testing of tumor tissue samples for PD-L1 assessment and for epidermal growth factor receptor and anaplastic lymphoma kinase mutations and C-ros oncogene receptor tyrosine kinase fusions; radiographic tumor assessment; tumor burden assessment; chest X-ray; serum pregnancy testing; 12-lead electrocardiogram; adverse event (AE) recording; physical examination, including vital signs, height, and weight assessments; Eastern Cooperative Oncology Group (ECOG) performance status assessment; and laboratory testing. Samples for an optional genomic sub-study may also be obtained.

During the treatment period, the following procedures are performed to assess efficacy and safety: QOL measurement using validated patient questionnaires, physical examination, ECOG performance status assessment; vital signs; laboratory testing, including pregnancy testing for women of childbearing potential; recording of AEs and concomitant medications. Computed tomography or magnetic resonance imaging (or positron emission tomography) for radiographic tumor burden assessment and tumor burden assessment based on RECIST 1.1 criteria are performed at pre-specified time points throughout the study.

Survival data is to be collected by phone or at an office visit every 3 months, until death, loss to follow-up, or withdrawal of study consent.

Results

It is expected that a R2810 combination regimen will increase median PFS by 4 months (increase from 6 month for standard of care platinum doublet chemotherapy to 10 months for either R2810 combination regimen) in patients with tumor expressing PD-L1 between 1%-<50% and in the overall study population. REGN2810 plus 4-6 cycles of platinum doublet chemotherapy or REGN2810 or REGN2810 plus Ipilimumab will prolong OS and improve ORR compared to platinum doublet chemotherapy.

Example 15: Clinical Study of Combinations of REGN2810 (Anti-PD-1 Antibody), Platinum-Based Doublet Chemotherapy, and Ipilimumab (Anti-CTLA-4 Antibody) Versus Pembrolizumab Monotherapy in First Line Treatment of Patients with Advanced or Metastatic Non Small-Cell Lung Cancer Whose Tumors Express PD-L1≥50%

The Example describes a clinical study of combinations of REGN2810 monotherapy platinum-based doublet chemotherapy, and ipilimumab (administered for up to 4 doses) versus pembrolizumab monotherapy in patients with advanced or metastatic, squamous or non-squamous NSCLC whose tumors express PD-L1 in ≥50% of tumor cells and who have received no prior systemic treatment for their advanced disease.

The primary objective of the study is to compare the progression-free survival (PFS) of REGN2810 (cemiplimab) plus ipilimumab combination therapy (hereinafter referred to as REGN2810/ipi) and REGN2810 plus 2 cycles only of platinum-based doublet chemotherapy plus ipilimumab combination therapy (hereinafter referred to as “REGN2810/chemo/ipi”) with standard-of-care pembrolizumab monotherapy in the first-line treatment of patients with advanced squamous or non-squamous non-small cell lung cancer (NSCLC) whose tumors express programmed death ligand 1 (PD-L1) in ≥50% of tumor cells. Additional objectives include further characterization of overall survival, tumor responses, patient-reported outcomes, safety, and pharmacokinetics (PK).

Study Population

The target population includes men and women ≥18 years of age with ≥50% PD-L1+ tumor cells, Stage IIIB or Stage IV, squamous or non-squamous NSCLC with no previous treatment for their advanced disease.

Inclusion Criteria:

1) Men and women ≥18 years of age 2) Patients with histologically or cytologically documented squamous or non-squamous NSCLC with stage IIIB or stage IV disease who received no prior systemic treatment for recurrent or metastatic NSCLC 3) Patients who received adjuvant or neoadjuvant platinum-doublet chemotherapy (after surgery and/or radiation therapy) and developed recurrent or metastatic disease more than 6 months after completing therapy are eligible 4) Patients who received adjuvant or neoadjuvant PD-1 or PD-L1 blockade and developed recurrent or metastatic disease more than 12 months after completing therapy are eligible 5) Archival or newly obtained formalin-fixed tumor tissue from a metastatic/recurrent site, which has not previously been irradiated 6) Tumor cells expressing PD-L1 in ≥50% of tumor cells by IHC performed by the central laboratory 7) At least 1 radiographically measureable lesion by computed tomography (CT) or magnetic resonance imaging (MRI) per RECIST 1.1 criteria. Target lesions may be located in a previously irradiated field if there is documented (radiographic) disease progression in that site. 8) ECOG performance status of ≤1 9) Anticipated life expectancy of at least 3 months 10) Adequate organ and bone marrow function as defined below: 11) Hemoglobin ≥8.0 g/dL 12) Absolute neutrophil count ≥1.0×10⁹/L 13) Platelet count ≥75,000/mm³ 14) Glomerular filtration rate (GFR) >30 mL/min/1.73 m² 15) Total bilirubin ≤1.5×upper limit of normal (ULN) (if liver metastases ≤3×ULN), with the exception of patients diagnosed with clinically confirmed Gilbert's syndrome 16) Aspartate aminotransferase (AST) and alanine aminotransferase (ALT)≤3×ULN or ≤5×ULN, if liver metastases 17) Alkaline phosphatase ≤2.5×ULN (or ≤5.0×ULN, if liver or bone metastases) 18) Not meeting criteria for Hy's law (ALT>3×ULN and bilirubin >2×ULN) 19) Willing and able to comply with clinic visits and study-related procedures 20) Provide signed informed consent 21) Able to understand and complete study-related questionnaires

Exclusion Criteria: 1. Patients who have never smoked, defined as smoking ≤100 cigarettes in a lifetime; 2. Active or untreated brain metastases or spinal cord compression. Patients are eligible if central nervous system (CNS) metastases are adequately treated and patients have neurologically returned to baseline (except for residual signs or symptoms related to the CNS treatment) for at least 2 weeks prior to enrollment. Patients must be off (immunosuppressive doses of) corticosteroid therapy (see exclusion criterion 7) for details on timing of discontinuation of steroids) 3. Patients with tumors tested positive for EGFR gene mutations, ALK gene translocations, or ROS1 fusions. All patients will have their tumor evaluated for EGFR mutations, ALK rearrangement, and ROS1 fusions 4. Encephalitis, meningitis, or uncontrolled seizures in the year prior to informed consent. 5. History of interstitial lung disease (eg, idiopathic pulmonary fibrosis or organizing pneumonia), or active, noninfectious pneumonitis that required immune-suppressive doses of glucocorticoids to assist with management, or of pneumonitis within the last 5 years. A history of radiation pneumonitis in the radiation field is permitted as long as pneumonitis resolved ≥6 months prior to enrollment. 6. Ongoing or recent evidence of significant autoimmune disease that required treatment with systemic immunosuppressive treatments, which may suggest a risk of immune-related treatment emergent adverse events (irTEAEs). The following are not exclusionary: vitiligo, childhood asthma that has resolved, residual hypothyroidism that required only hormone replacement, or psoriasis that does not require systemic treatment 7. Patients with a condition requiring corticosteroid therapy (>10 mg prednisone/day or equivalent) within 14 days of randomization. Physiologic replacement doses are allowed even if they are >10 mg of prednisone/day or equivalent, as long as they are not being administered for immunosuppressive intent. Inhaled or topical steroids are permitted, provided that they are not for treatment of an autoimmune disorder.

Study Design

This clinical trial is a study of the efficacy and safety of REGN2810/ipi versus REGN2810/chemo/ipi versus pembrolizumab monotherapy in patients with stage IIIB or stage IV squamous or non-squamous NSCLC whose tumors express PD-L1 in ≥50% of tumor cells and who have received no prior systemic treatment for their advanced disease.

The study consists of the following 3 periods: screening, treatment, and follow-up. Patients undergo a screening evaluation to determine their eligibility within 28 days prior to randomization. Eligible patients are randomized 1:1:1 to one of the following treatment arms:

-   -   Treatment Arm A: pembrolizumab monotherapy 200 mg every 3 weeks         (Q3W) for 108 weeks     -   Treatment Arm B: REGN2810 350 mg Q3W for 108 weeks plus         ipilimumab 50 mg every 6 weeks (Q6W) for up to 4 doses     -   Treatment Arm C: REGN2810 350 mg Q3W for 108 weeks plus         platinum-based doublet chemotherapy Q3W for 2 cycles and         ipilimumab 50 mg every 6 weeks (Q6W) for up to 4 doses

Patients receive their assigned treatment for the 108-week treatment period. Treatment may be discontinued early due to Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST 1.1)-defined progressive disease, unacceptable toxicity, withdrawal of consent, death, initiation of another anti-cancer treatment, or, for patients in Treatment Arms B and C, in specific instances of confirmed complete response (CR) or partial response (PR). Patients who experience RECIST 1.1-defined progressive disease on therapy may continue treatment if the investigator judges the patient to be experiencing clinical benefit and if the patient has not completed the 108-week treatment period. If further progressive disease (defined as an additional 10% increase in tumor burden from the time of initial progressive disease) is confirmed, treatment must be discontinued and other anti-cancer therapy considered, if appropriate. A similar approach to treatment beyond first evidence of progression may be offered to patients receiving pembrolizumab in Treatment Arm A.

Study Treatments

Treatment Arm A: Pembrolizumab administered at 200 mg as an IV infusion Q3W for 108 weeks

Treatment Arm B: REGN2810 administered at 350 mg as an intravenous (IV) infusion Q3W for 108 weeks in combination with ipilimumab administered IV over approximately 90 minutes at 50 mg Q6W for up to 4 doses.

Treatment Arm C: REGN2810 administered at 350 mg as an IV infusion Q3W for 108 weeks in combination with platinum-based doublet chemotherapy administered IV Q3W for 2 cycles and with ipilimumab administered IV over approximately 90 minutes at 50 mg Q6W for up to 4 doses

Procedures and Assessments

Procedures to be performed at screening include informed consent; assessment of inclusion/exclusion criteria; recording of medical, oncology, and concomitant medications histories; recording of demographics; collection and testing of tumor tissue samples for PD-L1 assessment and for epidermal growth factor receptor and anaplastic lymphoma kinase mutations and C-ros oncogene receptor tyrosine kinase fusions; baseline radiographic tumor assessment and tumor burden assessment; chest X-ray; serum pregnancy testing; 12-lead electrocardiogram; complete physical examination including vital signs, height, and weight assessments; Eastern Cooperative Oncology Group (ECOG) performance status assessment; adverse event (AE) recording; and laboratory testing. Samples for an optional genomic sub-study may also be obtained.

During the treatment period, the following procedures are performed to assess efficacy and safety: QOL measurement using validated patient questionnaires, physical examination, ECOG performance status assessment; vital signs; laboratory testing, including pregnancy testing for women of childbearing potential; recording of AEs and concomitant medications. Computed tomography or magnetic resonance imaging (or positron emission tomography) for radiographic tumor burden assessment and tumor burden assessment based on RECIST 1.1 criteria are performed at pre-specified time points throughout the study.

Survival data is collected by phone or at an office visit every 3 months, until death, loss to follow-up, or withdrawal of study consent.

Results

It is expected that either REGN2810 combination will prolong PFS by 1 to 5 months compared with pembrolizumab monotherapy. REGN2810 in combination with chemotherapy and/or anti-CTLA-4 antibody will prolong OS and improve ORR compared to pembrolizumab monotherapy.

The present invention is not to be limited in scope by the specific embodiments described herein. Indeed, various modifications of the invention in addition to those described herein will become apparent to those skilled in the art from the foregoing description and the accompanying figures. Such modifications are intended to fall within the scope of the appended claims. 

1-33. (canceled)
 34. A method of treating lung cancer or increasing the survival of a patient with lung cancer, comprising: (a) selecting a patient with non-small cell lung cancer (NSCLC); and (b) administering to the patient one or more doses of chemotherapy in combination with one or more doses of a therapeutically effective amount of the antibody or antigen-binding fragment thereof that binds specifically to PD-1 to the patient, thereby treating NSCLC in the patient; wherein the antibody or antigen-binding fragment thereof that binds specifically to PD-1 comprises three heavy chain complementarity determining regions (HCDR1, HCDR2 and HCDR3) of a heavy chain variable region (HCVR) and three light chain complementarity determining regions (LCDR1, LCDR2 and LCDR3) of a light chain variable region (LCVR), wherein HCDR1 comprises the amino acid sequence of SEQ ID NO: 3; HCDR2 comprises the amino acid sequence of SEQ ID NO: 4; HCDR3 comprises the amino acid sequence of SEQ ID NO: 5; LCDR1 comprises the amino acid sequence of SEQ ID NO: 6; LCDR2 comprises the amino acid sequence of SEQ ID NO: 7; and LCDR3 comprises the amino acid sequence of SEQ ID NO:
 8. 35. The method of claim 34, wherein the patient has not been previously treated with a systemic treatment for lung cancer.
 36. The method of claim 34, wherein the patient has not tested positive for epidermal growth factor receptor (EGFR) mutations, anaplastic lymphoma kinase (ALK) translocations, and/or ROS1 fusions.
 37. The method of claim 34, wherein the NSCLC is locally advanced and the patient is not a candidate for definitive chemoradiation, or the non-small cell lung cancer is metastatic.
 38. The method of claim 34, wherein the NSCLC is squamous or non-squamous stage III or IV disease, and the patient received no prior systemic treatment for recurrent or metastatic NSCLC.
 39. The method of claim 34, wherein the antibody or antigen-binding fragment thereof is administered concurrently with the chemotherapy.
 40. The method of claim 34, wherein the antibody or antigen-binding fragment thereof is administered prior to the chemotherapy.
 41. The method of claim 40, wherein the antibody or antigen-binding fragment thereof is administered about 1 day, more than 1 day, more than 2 days, more than 3 days, more than 4 days, more than 5 days, more than 6 days, more than 7 days, or more than 8 days prior to the chemotherapy.
 42. The method of claim 34, wherein the antibody or antigen-binding fragment thereof is administered after the chemotherapy.
 43. The method of claim 34, wherein each dose of the antibody or antigen-binding fragment thereof is administered 0.5-12 weeks after the immediately preceding dose.
 44. The method of claim 34, wherein each dose of the chemotherapy administered 1-6 weeks after the immediately preceding dose.
 45. The method of claim 34, wherein each dose of the chemotherapy is administered once every week, every 2 weeks, every 3 weeks, every 4 weeks or more.
 46. The method of claim 34, wherein each dose of the antibody or antigen-binding fragment thereof comprises 20-1500 mg.
 47. The method of claim 34, wherein each dose of the antibody or antigen-binding fragment thereof comprises 200, 250, 300, 350, 450, 600, 750, 800, 1000 or 1050 mg.
 48. The method of claim 34, wherein each dose of the antibody or antigen-binding fragment thereof comprises 350 mg.
 49. The method of claim 34, wherein each dose of the antibody or antigen-binding fragment thereof comprises 0.1-20 mg/kg of the patient's body weight.
 50. The method of claim 34, wherein each dose of the antibody or antigen-binding fragment thereof comprises 1, 3, 4, 5, 6 or 10 mg/kg of the patient's body weight.
 51. The method of claim 34, wherein the chemotherapy is selected from alkylating agents, antimetabolites, kinase inhibitors, spindle poison plant alkaloids, cytoxic/antitumor antibiotics, topisomerase inhibitors, photosensitizers, anti-estrogens and selective estrogen receptor modulators (SERMs), anti-progesterones, estrogen receptor down-regulators (ERDs), estrogen receptor antagonists, leutinizing hormone-releasing hormone agonists, anti-androgens, aromatase inhibitors, EGFR inhibitors, VEGF inhibitors, and platinum-based chemotherapy.
 52. The method of claim 51, wherein the chemotherapy comprises platinum-based chemotherapy.
 53. The method of claim 52, wherein the platinum-based chemotherapy comprises carboplatin, pemtrexed, cisplatin, gemcitabine, or a combination thereof.
 54. The method of claim 34, wherein the administration of the combination delays tumor growth and development, prevents tumor recurrence, increases duration of survival of the patient, increases progression-free survival of the patient, increases overall survival of the patient, increases duration of response, leads to complete response, leads to partial response, and/or leads to complete or partial disappearance of tumor cells or lesions, as compared to an untreated patient or a patient treated with either the antibody or antigen-binding fragment thereof or chemotherapy as monotherapy.
 55. The method of claim 34, wherein the administration of the combination increases progression-free survival by at least 4 months, as compared to a patient treated with chemotherapy as monotherapy.
 56. The method of claim 34, wherein the method further comprises administering to the patient an additional therapeutic agent, therapeutic regimen or procedure selected from cyclophosphamide, surgery, radiation, a cancer vaccine, a programmed death ligand 1 (PD-L1) inhibitor, a lymphocyte activation gene 3 (LAG3) inhibitor, a cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) inhibitor, an anti-glucocorticoid-induced tumor necrosis factor receptor (GITR) antibody, a T-cell immunoglobulin and mucin containing-3 (TIM3) inhibitor, a B- and T-lymphocyte attenuator (BTLA) inhibitor, a T cell immunoreceptor with Ig and ITIM domains (TIGIT) inhibitor, a CD47 inhibitor, an indoleamine-2,3-dioxygenase (IDO) inhibitor, a vascular endothelial growth factor (VEGF) antagonist, an angiopoietin-2 (Ang2) inhibitor, a transforming growth factor beta (TGFβ) inhibitor, an epidermal growth factor receptor (EGFR) inhibitor, an antibody to a tumor-specific antigen, an anti-CD3/anti-CD20 bispecific antibody, a vaccine, granulocyte-macrophage colony-stimulating factor, a cytotoxin, a chemotherapeutic agent, an IL-6R inhibitor, an TL-4R inhibitor, an IL-10 inhibitor, a cytokine, a T-cell therapy, an antiinflammatory drug, non-steroidal anti-inflammatory drugs, and a dietary supplement.
 57. The method of claim 56, wherein the additional therapeutic agent, therapeutic regimen or procedure is selected from surgery, radiation, a PD-L1 inhibitor, a LAG3 inhibitor, a CTLA-4 inhibitor, a VEGF inhibitor, and an EGFR inhibitor.
 58. The method of claim 34, wherein the antibody or antigen-binding fragment thereof is for intravenous administration.
 59. The method of claim 34, wherein the HCVR comprises the amino acid sequence of SEQ ID NO: 1 and the LCVR comprises the amino acid sequence of SEQ ID NO:
 2. 60. The method of claim 34, wherein the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 9 and a light chain comprising the amino acid sequence of SEQ ID NO:
 10. 61. The method of claim 34, wherein the antibody is cemiplimab.
 62. A method of treating lung cancer or increasing the survival of a patient with lung cancer, comprising: (a) selecting a patient with non-small cell lung cancer (NSCLC), wherein: (i) the patient has not been previously treated with a systemic treatment for lung cancer; (ii) the patient has not tested positive for epidermal growth factor receptor (EGFR) mutations, anaplastic lymphoma kinase (ALK) translocations, and/or ROS1 fusions; and (iii) the NSCLC is locally advanced and the patient is not a candidate for definitive chemoradiation, or the non-small cell lung cancer is metastatic; and (b) administering to the patient one or more doses of platinum-based chemotherapy in combination with one or more doses of a therapeutically effective amount of an antibody that binds specifically to PD-1, thereby treating NSCLC in the patient; wherein the antibody comprises three heavy chain complementarity determining regions (HCDR1, HCDR2 and HCDR3) of a heavy chain variable region (HCVR) and three light chain complementarity determining regions (LCDR1, LCDR2 and LCDR3) of a light chain variable region (LCVR), wherein HCDR1 comprises the amino acid sequence of SEQ ID NO: 3; HCDR2 comprises the amino acid sequence of SEQ ID NO: 4; HCDR3 comprises the amino acid sequence of SEQ ID NO: 5; LCDR1 comprises the amino acid sequence of SEQ ID NO: 6; LCDR2 comprises the amino acid sequence of SEQ ID NO: 7; and LCDR3 comprises the amino acid sequence of SEQ ID NO: 8; and the antibody is administered intravenously every three weeks at a dose of 350 mg.
 63. The method of claim 62, wherein the HCVR comprises the amino acid sequence of SEQ ID NO: 1 and the LCVR comprises the amino acid sequence of SEQ ID NO:
 2. 64. The method of claim 62, wherein the antibody comprises a heavy chain comprising the amino acid sequence of SEQ ID NO: 9 and a light chain comprising the amino acid sequence of SEQ ID NO:
 10. 65. The method of claim 62, wherein the antibody is cemiplimab. 